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
Organo-Selenium Induced Radical Ring-Opening Intramolecular Cyclization or Electrophilic Cyclization of 2- (Arylmethylene)cyclopropylaldehyde: A Tunable Synthesis of 1-Naphthaldehydes or 3-Oxabicyclo[3.1.0]hexan-2-ols
作者:Maozhong Miao、Xian Huang
DOI:10.1021/jo900805a
日期:2009.8.7
1-Naphthaldehydes and 3-oxabicyclo[3.1.0]hexan-2-ols can be prepared, respectively, by the intramolecular alkylation and cyclization of (E)-2-(arylmethylene)cyclopropylaldehyde 1 mediated by different organo-selenium reagents. The properties of selenium reagents may play an important role in the reactions. A rationale for these transformations is proposed.
Substrate-Controlled Selective Proximal and Distal C−C Bond Cleavage via Lewis Acid Mediated O-Acylation of 2-(Arylmethylene)cyclopropylaldehyde: A Stereoselective Synthesis of Bifunctional Methylenecyclobutanes and 1,3-Conjugated Dienes
作者:Xian Huang、Maozhong Miao
DOI:10.1021/jo801021f
日期:2008.9.1
ZnCl2-mediated reactions of (E)-2-(arylmethylene)cyclopropylaldehyde 1 with various acylchlorides provide a novel method for stereoselective synthesis of bifunctional methlylenecyclobutanes via a proximal-bond cleavage process. Nevertheless, when (Z)-1 was employed, the reactions give 1,3-conjugated dienes through distal-bond cleavage.
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.