Total Synthesis of (+)-Machaeriols B and C and of Their Enantiomers with a Cannabinoid Structure
作者:Hee Jin Lee、Yong Rok Lee、Sung Hong Kim
DOI:10.1002/hlca.200900014
日期:2009.7
An efficient and concise synthesis of the biologically interesting (+)‐machaeriol B (2) and its enantiomer 5 was accomplished from O‐phenylhydroxylamine (7) in four steps (Scheme 2). In addition, the first totalsynthesis of natural (+)‐machaeriol C (3) and its enantiomer 6 was achieved from the readily available ester 15 in eight steps (Scheme 4). The key strategies in the syntheses of 2 and 5 involved
Short and Protecting-Group-Free Approach to the (−)-Δ<sup>8</sup>-THC-Motif: Synthesis of THC-Analogues, (−)-Machaeriol B and (−)-Machaeriol D
作者:Grete Hoffmann、Armido Studer
DOI:10.1021/acs.orglett.8b01005
日期:2018.5.18
subsequent cyclization allows the construction of the tetrahydrodibenzopyran core of (−)-Δ8-THC which is also found in other natural products in one step. Using a benzofuryl substituted resorcinol, followed by diastereoselective hydroboration and oxidative or reductive workup, directly provides (−)-machaeriol B and D in 42% and 43% overall yields. Bromoresorcinol as a coupling partner delivers Br–THC