Highly diastereoselective synthesis of 3-methylenetetrahydropyrans by palladium-catalyzed oxa-[4 + 2] cycloaddition of 2-alkenylbenzothiazoles
作者:Xiaoxiao Song、Lei Xu、Qijian Ni
DOI:10.1039/d0ob01434f
日期:——
A highlydiastereoselectivesynthesis of 3-methylenetetrahydropyrans via palladium-catalyzed oxa-[4 + 2] cycloaddition of 2-alkenylbenzothiazoles with allyl carbonates bearing a nucleophilic alcohol side chain is presented. This synthetic methodology tolerates a wide variety of 2-alkenylbenzothiazoles and afforded the desired 3-methylenetetrahydropyrans in good yields and excellent dr. In addition
Enantioselective Reaction between 2-(Cyanomethyl)azaarenes and <i>N</i>-Boc-amino Sulfones
作者:Kezhou Wang、Chao Chen、Xihong Liu、Dan Li、Tianyu Peng、Xin Liu、Dongxu Yang、Linqing Wang
DOI:10.1021/acs.orglett.8b02205
日期:2018.9.7
benzothiazole or benzoxazole were designed and synthesized for asymmetric α-functionalization with N-Boc-amino sulfones. The Mannich adducts were obtained in high yields with good diastereo- and enantioselectivities. Aryl-substituted amino sulfones were tolerated under the current conditions, and the reaction can be performed on gram scale in good results.
A splendid method for synthesis of 2-(benzothiazole)-3-phenyl acrylonitrile derivatives catalysed by piperdine
作者:S Maddila、S B. Jonnalagadda
DOI:10.4314/bcse.v26i3.17
日期:——
A simple and efficient method is developed for the synthesis of 2-(benzothiazol-2-yl)-3-(substituted phenyl)acrylonitrile from 2-(benzothiazole-2-yl)-3-oxopentanedinitrile and aromatic aldehydes in the presence of a catalytic amount of piperdine into ethanol at reflux. Advantage of this procedure is relatively good yields (81-86%) with short reaction times (1.5-3 h), under moderate reaction conditions and simple workup procedure, plus easy preparation and handling of the catalyst.