Synthesis of resolvin E3<i>via</i>palladium-catalyzed addition of AcOH to vinyl epoxy alcohols
作者:Shuhei Tanabe、Yuichi Kobayashi
DOI:10.1039/c8ob03196g
日期:——
stereoselective epoxidation of 9-(TBS-oxy)nona-4Z,6E-dien-3R-ol with m-CPBA and the subsequent Pd-catalyzed addition of AcOH to the resulting syn vinyl epoxy alcohol followed by carbonate formation of the vic-syn-diol and TBS desilylation. The Mitsunobu inversion of the syn vinyl epoxy alcohol gave the anti isomer, which was converted to 3-(AcO)-6R,7S-(dihydroxy-carbonate)-4-nonen-1-ol, the intermediate
有效的消炎介质resolvin E3(RvE3)的(18 R)-和(18 S)-立体异构体是通过6 R,7 R-和6 R,7的碳酸盐的Wittig反应立体和对映选择性合成的S -dihydroxynona -2 E,4 E-二烯丙基,C12–C20部分,,盐对应于C1–C11部分。通过对3-(AcO)-6 R,7 R-或3-(AcO)-6 R,7 S-(二羟基碳酸酯)-4-壬烯-1-醇进行Swern氧化制备立体异构碳酸盐。一锅中自发消除AcO基团 (6 R(18 R)-RvE3的,7 R)-(二羟基碳酸酯)-醇依次由9-(TBS-氧基)nona-4 Z,6 E -dien-3 R -ol的立体选择性环氧化提供与米-CPBA和随后的Pd-催化加入AcOH到所得的顺式乙烯基环氧醇随后碳酸盐形成的VIC-SYN二醇和脱甲硅烷基TBS。合成乙烯基环氧醇的Mitsunobu转化反应得到反异构体,将其转变为3-(AcO)-6