Visible-Light-Induced Cascade Azidation/Cyclization of Activated Alkenes to Synthesize Azidated Indolo[2,1-a]isoquinolines

An efficient visible-light-induced radical cascade azidation/cyclization of 2-aryl indoles with trimethylsilyl azide(TMSN3)has been developed using organic dye Rose Bengal as the photocatalyst.This method did not require metal catalysts and additives,and used air as the oxidant to obtain diverse indolo[2,1-a]isoquinolin-6(5H)-ones in moderate to good yields.Mechanistic studies demonstrated that the reaction proceeded via a radical pathway.

1年生桢楠容器苗质量分级研究

为了制定1年生桢楠容器苗的分级标准,提高桢楠苗木种植成活率,采用系统聚类分析方法,建立以苗高和地径为质量分级指标的分级体系,获得3级分级标准,即Ⅰ级苗:苗高≥38 cm,地径≥0.65 cm;Ⅱ级苗:38 cm>苗高≥31.7 cm,0.65 cm>地径≥0.56 cm;Ⅲ级苗:苗高<31.7 cm,地径<0.56 cm。

Study on Grading Standard for One-Year-Old Container Seedling Quality of Phoebe zhennan

In order to improve the survival rate of planting seedlings of Phoebe zhen-nan, the grading standard for one-year-old container seedlings of Phoebe zhennan was developed by using cluster analysis. The results showed that the quality of Phoebe zhennan container seedlings could be estimated from seedling height and ground diameter. The Phoebe zhennan container seedlings were divided into 3 grades： Grade 1 （seedling height ≥ 38 cm; ground diameter ≥ 0.65 cm）, Grade 2 （31.7 cm ≤ seedling height 〈 38 cm; 0.56 cm ≤ ground diameter 〈 0.65 cm） and Grade 3 （seedling height 〈 31.7 cm; ground diameter 〈 0.56 cm）.

细叶桢楠生长与材性性状研究

对湖南省湘西自治州的细叶桢楠进行调查,并选取优良的细叶桢楠单株进行生长性状和材质性状的测定。结果表明:(1)细叶桢楠寿命较长。(2)细叶桢楠基本密度在0.483 2～0.620 9 g/cm3之间,纤维宽度在26.80～33.85μm之间,纤维长度在1.013 0～1.180 3 mm之间。(3)细叶桢楠基本密度与树龄、胸径和材积呈显著正相关关系,在生产上可以通过培育大径材提高基本密度的数值。

可见光促进有机染料催化2-芳基吲哚自由基烷氧羰基化反应研究

以Rose Bengal为有机染料光催化剂,在可见光照射下发展了2-芳基吲哚结构的自由基烷氧羰基化反应构建酯基取代的吲哚[2,1-a]异喹啉酮骨架.在温和的条件下,能以良好到优秀的收率得到结构多样的吲哚[2,1-a]异喹啉酮类化合物.该方法具有反应条件温和、利用可见光为能量来源、无需金属催化剂和价廉易得的肼甲酸酯为酯基来源等优点,更加绿色环保.