HOTf-Catalyzed Rearrangement of Methylenecyclopropane Aryl and Alkyl Alcohols
作者:Xiang-Ying Tang、Min Shi
DOI:10.1002/ejoc.201000509
日期:2010.7
An efficient method to synthesize multisubstituted naphthalene and cyclobutanol derivatives through ring opening/ring enlargement of readily available methylenecyclopropane diaryl alcohols or dialkyl- and monoalkyl- as well as monoaryl alcohols in moderate to good yields has been described in this paper. The formation of naphthalene derivatives is a sequential reaction involving a cation-induced ring
Ring-Opening Reaction of Methylenecyclopropanes Derived from Methylenecyclopropyl Aldehydes through Cope Rearrangement
作者:Xiang-Ying Tang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201000880
日期:2010.11
Tandem Wittig reaction/Cope rearrangement of methylenecyclopropyl aldehydes 1 with cinnamyltriphenylphosphonium bromide afforded a convenient method for the synthesis of cyclopentene derivatives 2 in moderate yields in a one-pot manner. Dialkyl 2-[(2-methylenecyclopropyl)methylene]malonates 3 derived from methylenecyclopropyl aldehydes 1 could produce two kinds of cyclopentene derivatives, 4 and 5
A Synthetic Protocol of Trans-Substituted Cyclopentenes via the Ring-Opening Rearrangement of MCP Alkenyl Derivatives
作者:Xiang-Ying Tang、Min Shi
DOI:10.1021/jo902512q
日期:2010.2.5
A efficient method to stereospecifically synthesize trans-substituted cyclopentene derivatives via the ring-opening rearrangement of readily available MCP alkenyl derivatives in moderate to good yields has been described. The control experiment based on the deuterium labeling experiment and the addition of TEMPO revealed that this transformation might proceed through a fast concerted pericyclic process rather than a simple radical pathway or an ionic pathway.
An Efficient Route to 2-Substituted<i>N</i>-(1-Amino-3-methylpyrrol)amides by Ring-Opening Cyclization of Benzylidene- and Alkylidenecyclopropylcarbaldehydes with Hydrazides
作者:Xiang-Ying Tang、Min Shi
DOI:10.1021/jo900730t
日期:2009.8.21
A convenient and efficient synthetic method for the construction of 2,3-disubstituted pyrrolamides in moderate to good Yields is established. The in situ generated water significantly accelerates the reaction rate. A possible mechanism involving the cascade ring-opening and thermal-induced rearrangement to produce the five-membered ring is proposed.
Palladium-Catalyzed Reactions of 3-Substituted Methylenecyclopropanes
作者:Li-Xiong Shao、Jia Li、Bao-Yu Wang、Min Shi
DOI:10.1002/ejoc.201001082
日期:2010.11
Pd-catalyzed reactions of 3-substitutedmethylenecyclopropanes (MCPs), in which the substituents can be either hydroxymethyl or formyl, have been thoroughly investigated in the presence or absence of an acid source. It was found that the Pd-catalyzed reactions of methylenecyclopropylcarbinols (Z)-1 in the presence of acetic acid, acetic acid 2-methylene-but-3-enyl esters 4 can be formed in moderate