Pentacovalent oxaphosphorane chemistry in organic synthesis. 2. Total syntheses of (.+-.)-trans- and (.+-.)-cis-neocnidilides
摘要:
Both (+/-)-trans- and (+/-)-cis-neocnidlides (1 and 2) have been synthesized via the route illustrated in Scheme III. The condensation of the 1,2-lambda-5-oxaphospholene 5b with valeraldehyde produced the highly substituted phosphonates 12s and 12a, which were transformed via an intramolecular Wadsworth-Horner-Emmons olefination reaction to the title compounds.
Pentacovalent oxaphosphorane chemistry in organic synthesis. 2. Total syntheses of (.+-.)-trans- and (.+-.)-cis-neocnidilides
摘要:
Both (+/-)-trans- and (+/-)-cis-neocnidlides (1 and 2) have been synthesized via the route illustrated in Scheme III. The condensation of the 1,2-lambda-5-oxaphospholene 5b with valeraldehyde produced the highly substituted phosphonates 12s and 12a, which were transformed via an intramolecular Wadsworth-Horner-Emmons olefination reaction to the title compounds.