First DMAP-mediated direct conversion of Morita–Baylis–Hillman alcohols into γ-ketoallylphosphonates: Synthesis of γ-aminoallylphosphonates
作者:Marwa Ayadi、Haitham Elleuch、Emmanuel Vrancken、Farhat Rezgui
DOI:10.3762/bjoc.12.290
日期:——
series of gamma-ketoallylphosphonates through a direct conversion of both primary and secondary Morita-Baylis-Hillman (MBH) alcohols by trialkyl phosphites with or without DMAP, used as additive, and under solvent-free conditions, is described herein for the first time. Subsequently, a highly regioselective Luche reduction of the primary phosphonate 2a (R = H) gave the corresponding gamma-hydroxyallylphosphonate
本文描述了通过有或没有DMAP的亚磷酸三烷基酯直接和间接的森田-贝利利斯-拜耳-希尔曼(MBH)醇直接和间接的森田-贝利斯-希尔曼(MBH)醇直接合成一系列γ-酮烯丙基膦酸酯的方法,该方法用作无添加剂条件。首次。随后,对伯膦酸酯2a(R = H)进行高度区域选择性的卢氏还原,得到了相应的γ-羟基烯丙基膦酸酯5,后者在作为催化剂的二碘(15 mol%)存在下与甲苯磺胺进一步反应,得到了相应的SN2型产物6a-d的分离产率为63-70%。或者,醇5产生相应的乙酸酯7,其由Ce(III)介导,成功地转化为相应的γ-氨基烯丙基膦酸酯8a-d。