Efficient synthesis of 3-substituted lactams using meerwein eschenmoser claisen [3,3] sigmatropic rearrangements.
作者:Brian Coates、David Montgomery、Paul J. Stevenson
DOI:10.1016/s0040-4039(00)79904-7
日期:1991.8
3-Allyl substituted five, six and seven membered ring lactams are readily available in good yields and reasonable selectivity by a formal Meerwein Eschenmoser Claisen [3,3] rearrangement, using the readily available N,N-dialkylalkoxymethylene iminium salts and lithium alkoxides derived from allyl alcohols.
Thermal o → c rearrangement of n-phenyl-allylimidates
作者:P. Metz、C. Mues
DOI:10.1016/s0040-4020(01)86212-8
日期:1988.1
Properly substituted N-phenyl-allylimidates 1 are shown to undergo preferential O → C sigmatropic rearrangement on heating. The diastereoselectivity of this reaction resembles the one observed in ortho ester Claisenrearrangements.
Complex Allylation by the Direct Cross-Coupling of Imines with Unactivated Allylic Alcohols
作者:Masayuki Takahashi、Martin McLaughlin、Glenn C. Micalizio
DOI:10.1002/anie.200900236
日期:2009.5.4
stereoselective: The convergent coupling of allylic alcohols with imines to deliver stereodefined homoallylic amines is described (see scheme). The process proceeds with net allylic transposition without the intermediacy of allylic organometallic reagents. Two stereodefined centers and a geometrically defined di‐ or trisubstitutedalkene are forged with high selectivity.
A Boron Analogue of Furan. The Synthesis and Coordination Chemistry of 2-Substituted-1,2-Oxaborolides
作者:Jinhui Chen、Xiangdong Fang、Zoltan Bajko、Jeff W. Kampf、Arthur J. Ashe
DOI:10.1021/om049473v
日期:2004.10.1
Two general methods have been developed for the synthesis of alkali metal salts of 2-substituted-1,2-oxaborolides (6). 2-Phenyl-1,2-oxaborolide (6b) has been converted to RuCp* complex 11b and to Mn(CO)3 complex 12b, in which the metals are η5-bound to the ligand.
Preparation of Stereodefined Homoallylic Amines from the Reductive Cross-Coupling of Allylic Alcohols with Imines
作者:Ming Z. Chen、Martin McLaughlin、Masayuki Takahashi、Michael A. Tarselli、Dexi Yang、Shuhei Umemura、Glenn C. Micalizio
DOI:10.1021/jo101535d
日期:2010.12.3
provide a means to translate the stereochemical information of the allylic alcohol to the homoallylic amine or to control diastereoselection in the coupling reactions of achiral allylic alcohols with chiralimines. Double asymmetric coupling reactions are also described that afford a unique means to control stereoselection in these complex convergent coupling processes. Finally, empirical models are