作者:Chao Li、Kun Jiang、Qin Ouyang、Tian-Yu Liu、Ying-Chun Chen
DOI:10.1021/acs.orglett.6b01194
日期:2016.6.3
1]-cycloaddition reaction of azaoxyallyl cation intermediates, generated in situ from α-halo hydroxamates bearing α-alkyl groups, and sulfur ylides is reported, furnishing useful β-lactams (dr >19:1) in fair to modest yields. In contrast, an unexpected formal [3 + 2]-cycloaddition reaction occurs to give γ-lactam derivatives for α-halo hydroxamates with α-aryl groups and sulfur ylides in the presence
据报道,由带有α-烷基基团的α-卤代异羟肟酸酯和硫代乙酰胺就地生成的氮杂烯丙基阳离子中间体的新的正式[3 +1]-环加成反应,公平地提供了有用的β-内酰胺(dr> 19:1)适度的产量。相反,在碱的存在下,发生意想不到的正式的[3 + 2]环加成反应,生成具有α-芳基和硫酰化基团的α-卤代异羟肟酸酯的γ-内酰胺衍生物。