5-Hydroxy-2-（2-phenylethyl）chromone（l） was synthesized from 2,6-dihydroxyacetophenone（7） obtained via four-steps resorcinol-reacting with phenylpropionic acid, the procedures involved are Baker-Venkataraman rear...5-Hydroxy-2-（2-phenylethyl）chromone（l） was synthesized from 2,6-dihydroxyacetophenone（7） obtained via four-steps resorcinol-reacting with phenylpropionic acid, the procedures involved are Baker-Venkataraman rear-rangement and cyclization which are easy to conduct, the overall yield is 32%.展开更多
A new synthesis of 2-phenylpyrano[3,2-b]phenothiazin-4（6H）-one derivatives was reported. First 2,10-diacetyl-3-hydroxyphenothiazine （2） was converted into their benzoyloxy esters （3a--3j） using different aro- ma...A new synthesis of 2-phenylpyrano[3,2-b]phenothiazin-4（6H）-one derivatives was reported. First 2,10-diacetyl-3-hydroxyphenothiazine （2） was converted into their benzoyloxy esters （3a--3j） using different aro- matic carboxylic acids in the presence of phosphorous oxychloride in pyridine. Benzoyloxy esters were converted into their 1,3-diones （4a--4j） by using dry KOH in pyridine via Baker-Venkataraman transformation reaction. The 1,3-diones thus obtained were cyclised to pyranophenothiazines （Sa--Sj） by refluxing in an acetic acid/HCl mixture.展开更多
The purpose of this paper is to establish several transformation formulae for bivariate basic hypergeometric series by means of series rearrangement technique. From these transformations, some interesting summation fo...The purpose of this paper is to establish several transformation formulae for bivariate basic hypergeometric series by means of series rearrangement technique. From these transformations, some interesting summation formulae are obtained.展开更多
文摘5-Hydroxy-2-（2-phenylethyl）chromone（l） was synthesized from 2,6-dihydroxyacetophenone（7） obtained via four-steps resorcinol-reacting with phenylpropionic acid, the procedures involved are Baker-Venkataraman rear-rangement and cyclization which are easy to conduct, the overall yield is 32%.
文摘A new synthesis of 2-phenylpyrano[3,2-b]phenothiazin-4（6H）-one derivatives was reported. First 2,10-diacetyl-3-hydroxyphenothiazine （2） was converted into their benzoyloxy esters （3a--3j） using different aro- matic carboxylic acids in the presence of phosphorous oxychloride in pyridine. Benzoyloxy esters were converted into their 1,3-diones （4a--4j） by using dry KOH in pyridine via Baker-Venkataraman transformation reaction. The 1,3-diones thus obtained were cyclised to pyranophenothiazines （Sa--Sj） by refluxing in an acetic acid/HCl mixture.
基金the National Natural Science Foundation of China (No.10771093) the Natural Science Foundation of the Education Department of Henan Province (No.2007110025)
文摘The purpose of this paper is to establish several transformation formulae for bivariate basic hypergeometric series by means of series rearrangement technique. From these transformations, some interesting summation formulae are obtained.
