An unprecedented protocol has been developed for the efficient synthesis of substituted tetrahydropyrans via a bismuth-promoted Prins cyclization of imines with homoallyl alcohols.In the presence of 40 mol%BiCl_(3),a ...An unprecedented protocol has been developed for the efficient synthesis of substituted tetrahydropyrans via a bismuth-promoted Prins cyclization of imines with homoallyl alcohols.In the presence of 40 mol%BiCl_(3),a wide variety of imines react smoothly with homoallyl alcohols at room temperature to give the corresponding 4-chlorotetrahydropyran derivatives in good to excellent yields.展开更多
Herein, we report an unprecedented regiospecific oxidative Mizoroki-Heck type reaction for the synthesis of α-difluoromethyl homoallylic alcohols. The reaction shows broad substrate scopes and high functional group t...Herein, we report an unprecedented regiospecific oxidative Mizoroki-Heck type reaction for the synthesis of α-difluoromethyl homoallylic alcohols. The reaction shows broad substrate scopes and high functional group tolerance. Late-stage functionalization of complex biologically active molecules demonstrates the synthetic potential of this transformation. Mechanistic study supports the involvement of MnBr_(2) catalyzed radical 1,2-silyl transfer.展开更多
Dicyano-functionalized MCM-41-supported palladium complex was prepared from dicyano-functionalized MCM-41 and palladium chloride. This complex exhibited high catalytic activity in the allylation of aldehydes and keton...Dicyano-functionalized MCM-41-supported palladium complex was prepared from dicyano-functionalized MCM-41 and palladium chloride. This complex exhibited high catalytic activity in the allylation of aldehydes and ketones with allylic chlorides in the presence of SnCl2. This polymeric palladium complex can be recovered and reused without noticeable loss of activity.展开更多
Since the pioneering work on Cr(Ⅲ)-catalyzed enantioselective[4+2]/allylboration reported by Hall and co-workers,a variety of catalytic methodologies for the asymmetric allylic borylation reactions have been develope...Since the pioneering work on Cr(Ⅲ)-catalyzed enantioselective[4+2]/allylboration reported by Hall and co-workers,a variety of catalytic methodologies for the asymmetric allylic borylation reactions have been developed to provide chiral allylboronates bearing a wide range of functional groups.This review article describes recent advances in transition-metal catalyzed preparation of chiral allylboronates,especially on those in the past three years,and with the emphasis on the aspect of asymmetric catalysis.According to the mechanism of achieving the chemo-,regio-,stereo-and enantioselectivities,the discussion is divided in two parts:substrate-controlled and catalyst-controlled synthesis.展开更多
基金We are grateful for the financial support from the National Natural Science Foundation of China(No.21202154)Nanjing Institute of Technology Fund for Talents(No.YKJ201329)Nanjing Institute of Technology and the University of Science and Technology of China.
文摘An unprecedented protocol has been developed for the efficient synthesis of substituted tetrahydropyrans via a bismuth-promoted Prins cyclization of imines with homoallyl alcohols.In the presence of 40 mol%BiCl_(3),a wide variety of imines react smoothly with homoallyl alcohols at room temperature to give the corresponding 4-chlorotetrahydropyran derivatives in good to excellent yields.
基金the National Natural Science Foundation of China (No. 21901191)the Fundamental Research Funds for the Central Universities and Wuhan University for financial support
文摘Herein, we report an unprecedented regiospecific oxidative Mizoroki-Heck type reaction for the synthesis of α-difluoromethyl homoallylic alcohols. The reaction shows broad substrate scopes and high functional group tolerance. Late-stage functionalization of complex biologically active molecules demonstrates the synthetic potential of this transformation. Mechanistic study supports the involvement of MnBr_(2) catalyzed radical 1,2-silyl transfer.
基金Project supported by the National Natural Science Foundation of China （No. 20462002）.
文摘Dicyano-functionalized MCM-41-supported palladium complex was prepared from dicyano-functionalized MCM-41 and palladium chloride. This complex exhibited high catalytic activity in the allylation of aldehydes and ketones with allylic chlorides in the presence of SnCl2. This polymeric palladium complex can be recovered and reused without noticeable loss of activity.
基金NSFC(Grant No.22071095)National Young Talents Program and SUSTech for financial support.
文摘Since the pioneering work on Cr(Ⅲ)-catalyzed enantioselective[4+2]/allylboration reported by Hall and co-workers,a variety of catalytic methodologies for the asymmetric allylic borylation reactions have been developed to provide chiral allylboronates bearing a wide range of functional groups.This review article describes recent advances in transition-metal catalyzed preparation of chiral allylboronates,especially on those in the past three years,and with the emphasis on the aspect of asymmetric catalysis.According to the mechanism of achieving the chemo-,regio-,stereo-and enantioselectivities,the discussion is divided in two parts:substrate-controlled and catalyst-controlled synthesis.
