The synthesis of l-(+)-homophenylalanine hydrochloride
摘要:
L-(+)-Homophenylalanine hydrochloride was synthesized from N-phthaloyl-L-(-)-aspartic anhydride 2 in three steps in 55% overall yield with 99% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.
Regio- and stereoselective 1,6-photocyclization of aspartic acid-derived chiral γ-ketoamides
作者:Axel G. Griesbeck、Heike Heckroth、Hans Schmickler
DOI:10.1016/s0040-4039(99)00448-7
日期:1999.4
Chiral cc-acylamino gamma-ketoamides 2 were irradiated and regioisomeric 1,6-cyclization products 3 and 4 obtained in high yields. Symmetrically N,N-disubstituted substrates 2a,b reacted diastereoselectively to give the all-cis products 3a,b in high yields. High 1,3-asymmetric induction was also observed for the unsymmetrically N,N-disubstituted 2d and 2e. The stereoselectivity of these reactions is discussed in terms of SOC-controlled spin inversion geometries. (C) 1999 Elsevier Science Ltd. All rights reserved.