Preparation of 2-azaallyl anions and imines from N-chloroamines and their cycloaddition and allylation
作者:Shveta Pandiancherri、David W. Lupton
DOI:10.1016/j.tetlet.2010.11.142
日期:2011.2
Exposure of N-chloroamines to (KOBu)-Bu-t or LDA, in the presence of PMDETA or HMPA, provides 2-azaallyl anions capable of pi 4s + pi 2s cycloaddition reactions with a range of olefins. Good yields were achieved with stabilised systems, however, they were more modest when accessing semi-stabilised 2-azaallyl anions. By modifying the reaction conditions, one-pot dehydrochlorination/allylation can also be achieved with a range of N-chloroamines. (C) 2010 Published by Elsevier Ltd.
Regioselective addition reaction of organolanthanide reagents to α,β-unsaturated imines
作者:Changtao Qian、Taisheng Huang
DOI:10.1016/s0022-328x(97)00460-9
日期:1997.12
Organolanthanum reagents[RLaCl2] generated in situ from LaCl3 and alkyl lithium or allyl magnesium could undergo a highly regioselective 1,2-addition to N-alkyl alpha,beta-unsaturated imines, which provided a new and useful approach to synthesize allyl amines with good yields and high regioselectivity. Furthermore, for N-chiral alkyl alpha,beta-unsaturated imine, in the case of n-butyl lithium, the diastereoselectivity achieved highly 90%. (C) 1997 Elsevier Science S.A.