2‐disubstituted N‐sulfonylaziridines bearing OTBS groups and aryl groups at two different substitutions of the aziridine ring has been prepared. Based on them, a stepwise strategy involving ring opening of aziridines and C−H activation/cyclization has been developed for the generalsynthesis of spiroindoline pyrans and spiroindoline furans.
stepwise cyclization involving a sequential ringopening of aziridines and Pictet–Spengler reaction has been developed for the synthesis of 4-spiroannulated tetrahydroisoquinoline compounds (22 examples). The novel features of this strategy include high bonding efficiency and cyclization efficiency, broad substrate scope, mild conditions and good generality of the ring size in the product.
Effect of substituents on ring size in radical cyclizations. 1. Methyl vs. phenyl
作者:Thomas W. Smith、George B. Butler
DOI:10.1021/jo00395a002
日期:1978.1
Method of amidocarbonylation reaction
申请人:Kobayashi Shu
公开号:US20070197765A1
公开(公告)日:2007-08-23
A novel method of an amidocarbonylation reaction among an aldehyde compound, an amide compound, and carbon monoxide, which comprises using a palladium-supporting crosslinked-polymer composition containing palladium clusters having a major-axis length of 20 nm or shorter to conduct the amidocarbonylation reaction. Thus, an N-acyl-α-amino acid can be more efficiently and selectively synthesized in a dean reaction system. Also provided is a catalyst for use in the method.