Rh(I)-Catalyzed 1,4-Conjugate Addition of Alkenylboronic Acids to a Cyclopentenone Useful for the Synthesis of Prostaglandins
作者:Jin-Fong Syu、Yun-Ting Wang、Kung-Cheng Liu、Ping-Yu Wu、Julian P. Henschke、Hsyueh-Liang Wu
DOI:10.1021/acs.joc.6b01913
日期:2016.11.18
An efficient and trans-diastereoselective Rh(I)-catalyzed 1,4-conjugate addition reaction of alkenylboronic acids and a homochiral (R)-4-silyloxycyclopentenone useful for the synthesis of derivatives of prostaglandins E and F is described for the first time. The reaction functions under mild conditions and is particularly rapid (≤6 h) under low power (50 W) microwave irradiation at 30 °C in MeOH in
首次描述了有效且反式的非对映选择性的Rh(I)催化的烯基硼酸与可用于合成前列腺素E和F的高手性(R)-4-甲硅烷氧基环戊烯酮的1,4-共轭加成反应。该反应在温和条件下起作用,在催化量的KOH存在下于30°C在MeOH中的低功率(50 W)微波辐射下,反应特别快速(≤6 h)。在这些条件下,通常需要3摩尔%的[RhCl(COD)] 2以产生高收率。该方法还可以在化学计算量的KOH存在的情况下,无需在3°C进行微波辐射的情况下运行。在这些条件下,仅[RhCl(COD)] 2为1.5摩尔%需要,但是反应相当慢。该方法接受一系列芳基和烷基取代的烯基硼酸,其实用性已通过PGF2α(地诺前列素)和他氟前列素的合成得到证明。