Practical chemoenzymatic synthesis of a 3-pyridylethanolamino β3 adrenergic receptor agonist
作者:John Y.L Chung、Guo-Jie Ho、Michel Chartrain、Chris Roberge、Dalian Zhao、John Leazer、Roger Farr、Michael Robbins、Kateeta Emerson、David J Mathre、James M McNamara、David L Hughes、Edward J.J Grabowski、Paul J Reider
DOI:10.1016/s0040-4039(99)01353-2
日期:1999.9
A chemoenzymatic synthesis of beta(3) agonist 1 suitable for large scale preparation is described. The key chiral 3-pyridylethanolamine intermediate (R)-7 was prepared via an improved Neber rearrangement and a yeast-mediated asymmetric reduction. The tetrazolone fragment of the molecule was constructed via a dipolar cycloaddition between 1-(cyclopentyl)-3-propylazide and p-chlorosulfonyl phenylisocyanate. Sulfonamide coupling of these two intermediates under Shotten-Baumann conditions, followed by a borane reduction of the amide afforded 1 in 20-32% overall yield from 3-acetylpyridine, (C) 1999 Elsevier Science Ltd. All rights reserved.