peptidomimetics serve as biologically active compounds or as intermediates for other peptidyl isosteres. The N-terminal side of the C=C bond could be easily prepared in an opticallypure form from α-amino acids. Synthesis of C-terminal building blocks in an opticallypure form is more challenging. We developed a chemoenzymatic stereoselective approach to such optically active C-terminal building blocks to
肽基烯烃肽模拟物用作生物活性化合物或用作其他肽基等排体的中间体。C=C 键的 N 端侧可以很容易地从 α-氨基酸以光学纯的形式制备。以光学纯形式合成 C 端结构单元更具挑战性。我们开发了一种化学酶立体选择性方法,用于通过各种反应组装成肽基烯烃的光学活性 C 端结构单元。它们包括亲电子醛和亲核砜、鏻盐、膦酸盐和二硒化物。前手性二酯到相应羟基酯的关键酶水解引入了光学活性。随后化学反应的顺序,无论是保护-水解-功能化还是功能化-水解-保护,
Oxazolidinones and 2,5-Dihydrofurans via Zinc-Catalyzed Regioselective Allenylation Reactions of <scp>l</scp>-α-Amino Aldehydes
作者:Farzad Zamani、Stephen G. Pyne、Christopher J. T. Hyland
DOI:10.1021/acs.joc.7b00969
日期:2017.7.7
The simultaneous control of diastereoselectivity and regioselectivity in Zn-catalyzed allenylation reactions of N-protected L-alpha-amino aldehydes is reported. A reversal in diastereoselectivity could be realized by variation of the alpha-amino aldehyde protecting groups. A range of 1-allenyl-2-amino alcohols were obtained with excellent regioselectivity and converted to oxazolidinones and dihydrofurans. Many of which could be isolated as single diastereoisomers and without significant erosion of ee, making this a practical catalytic synthesis of highly functionalized heterocycles.