Sulfur-containing Heterocycles Derived by Reaction of N-Thioacylamino Alcohols with Lawesson’s Reagent and Saponification of N-Thioacylamino Esters
摘要:
The treatment of 2-N-thioacylamino alcohols (1) with Lawesson's reagent [LR: 2,4-bis(p-methoxyphenyl)-1,3,2,4-dithiaphosphetane 2,4-disulfide] afforded the sulfur-containing heterocycles, 1,3-thiazolines (2) in moderate to good yields, exclusively. The saponification of N-thioacylamino esters (4), which were prepared by the thionation of N-acylamino esters (3) with LR, with K2CO3 gave 3,1-benezothiazines (5) and 3,1-benzoxazines (6).
Sunlight-Driven Forging of Amide/Ester Bonds from Three Independent Components: An Approach to Carbamates
摘要:
A photoredox catalytic route to carbamates enabled by visible irradiation (or simply sunlight) has been developed. This process leads to a novel approach to the construction of heterocyclic rings wherein the amide or ester motifs of carbamates were assembled from three isolated components. Large-scale experiments were realized by employing continuous flow techniques, and reuse of photocatalyst demonstrated the green and sustainable aspects of this method.
Enantiospecific synthesis of 5-phenylpyrrolo[2,1-c][1,4]benzodiazepines
作者:Loreto Legerén、Eduardo Gómez、Domingo Domínguez
DOI:10.1016/j.tetlet.2008.09.168
日期:2008.12
Enantiomerically pure 5-phenylpyrrolo[2,1-c][1,4]benzodiazepines were synthesized starting from 2-aminobenzophenones and 2-amino-4-methoxyxanthone, using l-proline as a chiral building block.
使用1-脯氨酸作为手性结构单元,从2-氨基二苯甲酮和2-氨基-4-甲氧基黄酮开始合成对映体纯的5-苯基吡咯并[2,1- c ] [1,4]苯并二氮杂。
Metanolysis of phenyl-substituted benzhydryl chlorides