Carotenoids and Related Polyenes, Part 12 First Total Synthesis and Absolute Configuration of 3'-Deoxycapsanthin and 3,4-Didehydroxy-3'-deoxycapsanthin
The synthesis of 3'-deoxycapsanthin (1) and 3,4-didehydroxy-3'-deoxycapsanthin (2), carotenoids of paprika, has been achieved by employing Lewis acid-promoted regio- and stereoselective rearrangement of the C(15)-epoxy dienal 5a. The absolute stereochemistry of the newly formed C-5 chiral center of rearrangement product 6a was determined to be (R) from its alternative synthesis derived from (+)-(R)-camphonanic
A total synthesis of (+)-herbertene from (+)-camphoric acid is described using a Diels–Alder reaction as the key step.
以Diels-Alder反应为关键步骤描述了由(+)-樟脑酸合成(+)-香波烯的过程。
Convenient route to enantiopure aryl cyclopentanes via Diels–Alder reaction of asymmetric dienes. Total synthesis of (+)-herbertene and (+)-cuparene
作者:Abhijit Nayek、Michael G.B Drew、Subrata Ghosh
DOI:10.1016/s0040-4020(03)00807-x
日期:2003.7
A general route for the synthesis of highly substituted aryl cyclopentanes has been developed involving Diels–Alder reaction of asymmetric dienes prepared from (+)-camphoric acid followed by aromatization of the resulting cyclohexene derivatives. Employing this protocol enantiospecific synthesis of (+)-herbertene and (+)-cuparene has been accomplished.