A new class of optically active pyrrole derivatives: (3R)-3-(pyrrol-1-yl)alk-1-enes from d-α-aminoacids
作者:Roberta Settambolo、Giuditta Guazzelli、Lucia Mengali、Alessandro Mandoli、Raffaello Lazzaroni
DOI:10.1016/s0957-4166(03)00524-x
日期:2003.9
(3R)-3-(Pyrrol-1-yl)but-1-ene 4a, (3R)-4-methyl-3-(pyrrol-1-yl)pent-1-ene 4b, (3R)-3-(pyrrol-1-yl)hex-1-ene 4c in high enantiomeric excess (>92%) were prepared starting from D-alpha-amino acids. The crucial steps in the synthesis, reduction (DIBAH) of the corresponding pyrrolylesters to the corresponding pyrrolylaldehydes followed by Wittig olefination proceeded without compromising the stereochemical integrity. (C) 2003 Elsevier Ltd. All rights reserved.
(3R)-3-(吡咯-1-基)丁-1-烯 4a、(3R)-4-甲基-3-(吡咯-1-基)戊-1-烯 4b 和 (3R)-3-(吡咯-1-基)己-1-烯 4c 以高对映体过量率 (>92%) 由 D-α-氨基酸制备。合成的关键步骤是通过使用 DIBAH 将相应的吡咯甲酸酯还原为相应的吡咯甲醛,随后进行 Wittig 烯化反应。这些步骤在进行过程中并未影响立体化学的完整性。
(C) 2003 Elsevier Ltd. 保留所有权利。