Synthesis of (2R,5S)-dihydroxymethyl-(3R,4R)-dihydroxypyrrolidine (DGDP) via stereoselective amination using chlorosulfonyl isocyanate
作者:In Su Kim、Sin Jung Kim、Jae Koo Lee、Qing Ri Li、Young Hoon Jung
DOI:10.1016/j.carres.2007.04.021
日期:2007.8
cinnamyl anti-1,2-polybenzyl ethers 5 and 6 using chlorosulfonyl isocyanate (CSI) and ring cyclization to form the pyrrolidine ring. The reaction between anti-1,2-polybenzyl ether 5 and CSI in toluene at 0 degrees C afforded the corresponding anti-1,2-amino alcohol 4 as a major product with a diastereoselectivity of 16:1 in 76% yield. The mechanism underlying these reactions may be explained by the neighboring-group
立体选择性合成(2R,5S)-二羟甲基-(3R,4R)-二羟基吡咯烷1(2,5-dideoxy-2,5-imino-d-glucitol,DGDP)的方法从七步开始2,3,4,6-四-O-苄基-d-甘露糖(7)。制备标题化合物1的关键步骤涉及使用氯磺酰基异氰酸酯(CSI)对肉桂基抗1,2-聚苄基醚5和6进行区域选择性和非对映选择性胺化,以及环环化形成吡咯烷环。抗1,2-聚苄基醚5和CSI在甲苯中于0℃下反应,得到相应的抗1,2-氨基醇4为主要产物,非对映选择性为16:1,收率为76%。这些反应的潜在机制可能由导致立体化学保留的邻近基团效应解释。