Structure tuning of lithium amide for asymmetric 1,4-addition to cinnamate and subsequent demasking
摘要:
Systematic structure tuning of lithium amides derived from benzyl-N-TMS-, allyl-N-TBDMS-, and diisopropylamines lead to several candidates including anthracen-9-ylmethanamine which provided high performance in the enantioselective 1,4-addition (91% ee) and following hydrogenolysis with 10% Pd/C-H-2 in methanol to afford beta-amino ester. (C) 2004 Elsevier Ltd. All rights reserved.