Gold-Catalyzed Regioselective Hydration of Propargyl Acetates Assisted by a Neighboring Carbonyl Group: Access to α-Acyloxy Methyl Ketones and Synthesis of (±)-Actinopolymorphol B
作者:Nayan Ghosh、Sanatan Nayak、Akhila K. Sahoo
DOI:10.1021/jo101995g
日期:2011.1.21
suitable to perform hydration of TMS-substituted propargyl acetates, even though it requires prolonged reaction time for completion. Stereointegrity of the propargylic acetate is preserved during the hydration. The robustness of the system is successfully demonstrated through gram scale preparation of the product in nearly quantitative yield. The common α-acyloxy methyl ketone is transformed to 1,2-diol
通过范围广泛的乙酸炔丙酯的区域选择性水合证明了合成α-酰氧基甲基酮的一般的原子经济方法。在二恶烷-H 2 O中包含1%Ph 3 PAuCl和1%AgSbF 6的现成催化剂可在短时间内在环境温度下在短短时间内有效地水解炔丙基乙酸酯的末端炔烃。如18所示,相邻的羰基可促进有效的区域选择性水化O标记研究。观察到功能部分的相容性和对各种酸不稳定的保护基的耐受性。催化条件也适合于进行TMS取代的炔丙基乙酸酯的水合作用,即使需要更长的反应时间才能完成。在水合过程中保留了炔丙基乙酸酯的立体完整性。通过以几乎定量的产量进行克规模的产品制备,成功地证明了该系统的鲁棒性。普通的α-酰氧基甲基酮被转化为1,2-二醇和1,2-氨基醇衍生物。肌动蛋白多酚B的合成首次实现,其中乙酸炔丙基酯的水合是关键步骤。