Asymmetric Synthesis of the Carbocyclic Nucleoside Building Block (R)-(+)-4-Aminocyclopentenone Using δ-Amino β-Ketophosphonates and Ring-Closing Metathesis (RCM)
摘要:
Amino keto-2,7-dienes undergo ring-closing metathesis (RCM) to give 4-aminocyclopentenones, valuable intermediates in the asymmetric construction of carbocyclic nucleosides. The key amino ketodienes were prepared using delta-amino beta-ketophophonates, a new sulfinimine-derived chiral building block, and HWE chemistry.
Synthesis and applications of nonracemic β-amino aldehydes to the asymmetric synthesis of piperdines: (+)-dihydropinidine
摘要:
New methodology for the enantioselective synthesis of stable;N-protected beta-amino aldehydes 5 and 6, and their application to the asymmetric synthesis of (+)-2-phenylpiperdine (11) and (+)-dihydropinidine (14) is described. (C) 1998 Elsevier Science Ltd. All rights reserved.
Asymmetric Synthesis of β-Amino Carbonyl Compounds with <i>N</i>-Sulfinyl β-Amino Weinreb Amides
作者:Franklin A. Davis、M. Brad Nolt、Yongzhong Wu、Kavirayani R. Prasad、Danyang Li、Bin Yang、Kerisha Bowen、Seung H. Lee、John H. Eardley
DOI:10.1021/jo0402780
日期:2005.3.1
readily add to enantiopure N-sulfinyl β-aminoWeinrebamides providing the corresponding, stable, N-sulfinyl β-amino carbonyl compounds in good to excellent yields. This new methodology represents a general solution to the problem of β-amino carbonyl syntheses, which are important chiral building blocks and constituents of natural products. N-Sulfinyl β-aminoWeinrebamides are prepared by reaction of the