morusin synthesis

Yield: 67%

Reaction Conditions:

Stage #1:2-[2-(4-methoxybenzyloxy)-4-hydroxyphenyl]-5-hydroxy-8,8-dimethyl-3-(3-methyl-but-2-enyl)-pyrano[2,3-f]chromen-4-one with pyridine;acetyl chloride at 20;Inert atmosphere;
Stage #2: with ethanethiol;tin(ll) chloride in acetonitrile at 20;Inert atmosphere;
Stage #3: with hydrazine hydrate in tetrahydrofuran at 20; for 0.333333 h;Inert atmosphere;

References:

Tseng, Tsui-Hwa;Chuang, Shien-Kai;Hu, Chao-Chin;Chang, Chia-Fu;Huang, Yu-Chao;Lin, Cheng-Wei;Lee, Yean-Jang [Tetrahedron,2010,vol. 66,# 6,p. 1335 - 1340] Location in patent:experimental part