Synthesis of atropisomeric 2-(1-aminoalkyl)-1-naphthamides by stereoselective addition of organolithiums to a 2-imino-1-naphthamide
摘要:
Unlike the corresponding aldehydes, 2-(N-methylformimino)-N,N-dialkyl-1-naphthamides react highly atroposelectively with simple organolithium reagents to give atropisomeric amines whose syn stereochemistry is thermodynamically preferred over anti. (C) 1999 Elsevier Science Ltd. All rights reserved.
Atroposelective attack of nucleophiles on 2-formyl-1-naphthamides and their derivatives: chelation and non-chelation control
作者:Jonathan Clayden、Catherine McCarthy、Neil Westlund、Christopher S. Frampton
DOI:10.1039/b000669f
日期:——
Organometallic nucleophiles attack 2-formyl-1-naphthamides to give secondary alcohols with widely varying atroposelectivity. By careful choice of reagent, selectivities of up to >99∶1 in favour of either the anti or the syn atropisomer can be obtained. Ethers and amines may be synthesised atroposelectively from acetals or imines. The sense of the selectivity is determined by the reactive conformation of the Ar–CHO bond, itself dependent on the coordinating and chelating ability of the nucleophile’s counterion. The roles of conformation, Lewis acids, and chelation/non-chelation control in relation to stereoselectivity are discussed.
Synthesis of atropisomeric 2-(1-aminoalkyl)-1-naphthamides by stereoselective addition of organolithiums to a 2-imino-1-naphthamide
作者:Jonathan Clayden、Neil Westlund、Francis X. Wilson
DOI:10.1016/s0040-4039(99)00519-5
日期:1999.4
Unlike the corresponding aldehydes, 2-(N-methylformimino)-N,N-dialkyl-1-naphthamides react highly atroposelectively with simple organolithium reagents to give atropisomeric amines whose syn stereochemistry is thermodynamically preferred over anti. (C) 1999 Elsevier Science Ltd. All rights reserved.