作者:Philip A. Woods、Louis C. Morrill、Ryan A. Bragg、Andrew D. Smith
DOI:10.1002/chem.201100995
日期:2011.9.19
Screening of a range of chiral isothioureas and acyl donors to promote the asymmetric C‐acylation of silyl ketene acetals indicates that C(2)‐aryl‐dihydropyrimidobenzothiazole‐derived isothioureas and propionic anhydride give optimal reactivity and enantioselectivity in this process. Under optimised conditions 3‐acyl‐3‐aryl or 3‐acyl‐3‐alkylfuranones are prepared in good yields and moderate to excellent
筛选一系列手性异硫脲和酰基供体以促进甲硅烷基酮缩醛的不对称C-酰化表明,在此过程中,C(2)-芳基-二氢嘧啶基苯并噻唑衍生的异硫脲和丙酸酐可提供最佳的反应性和对映选择性。在优化的条件下,可以以高收率和中等至极好的对映选择性(高达98%ee;ee =对映异构体过量)制备3-酰基-3-芳基或3-酰基-3-烷基呋喃 酮。