Synthesis of enantiopure 2,7-diaryl-1,6-dioxaspiro[4.4]nonanes via enantioselective reduction of prochiral γ-nitroketones by diisopinocampheylchloroborane (DIP-C1™)
摘要:
The enantioselective reduction of gamma-nitroketones 1-4 and gamma-nitrodiketones 5-6 by the chiral reducing agent (+)- or (-)-diisopinocampheylchloroborane (DTP-Cl(TM)) afforded respectively nitroalcohols 7-9 with e.e.'s ranging from 33 to 86% and nitrodiols 11-12 with complete diastereoselectivity and e.e. > 95 %. Nitrodiols (1S,7S)-11 and (1S,7S)-12 were then used as chiral precursors for the synthesis of the enantiopure 2,7-diphenyl- and 2,7-di-(2'-methoxyphenyl)-2,6-dioxaspiro[4.4]nonanes, 21 and 22, as EE/ZZ mixtures. Copyright (C) 1996 Elsevier Science Ltd
Two-directional synthesis as a tool for diversity-oriented synthesis: Synthesis of alkaloid scaffolds
作者:Kieron M G O’Connell、Monica Díaz-Gavilán、Warren R J D Galloway、David R Spring
DOI:10.3762/bjoc.8.95
日期:——
Two-directional synthesis represents an ideal strategy for the rapid elaboration of simple starting materials and their subsequent transformation into complex molecular architectures. As such, it is becoming recognised as an enabling technology for diversity-orientedsynthesis. Herein, we provide a thorough account of our work combining two-directional synthesis with diversity-orientedsynthesis, with particular