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Synthesis of bridged carbocyclic systems related to diterpenes involving intramolecular cyclisation of diazomethyl ketones

✍ Scribed by Basudeb Basu; Debabrata Mukherjee


Publisher
Elsevier Science
Year
1984
Tongue
French
Weight
145 KB
Volume
25
Category
Article
ISSN
0040-4039

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✦ Synopsis


The tricyclic dienediones 5,6 and L have been synthesised for entry into the ring systems of the tetracyclic diterpenes atisiFe;e (_1_), phyllocladene

(3) and hibaene ( 4) respectively.

Atisirene and isoatisirene are tetracyclic diterpenes isolated la from the mod of


πŸ“œ SIMILAR VOLUMES


Synthesis of bridged tetracyclic systems
✍ Sanat K. Maity; Basudeb Basu; Debabrata Mukherjee πŸ“‚ Article πŸ“… 1983 πŸ› Elsevier Science 🌐 French βš– 137 KB

The tetracycllc bridged-ring enones 1, 5 an& 3 have been prepared through acidcatalysed Intramolecular cycllsatlon of the dlazomethyl ketones 11, 16 and 22 respectively for entry Into the ring system of aphldlcolln( 4) and related dlterpenes --

Asymmetric bridging annulation reaction
✍ Christian CavΓ©; Sophie Boggero; Ramon Casas; FranΓ§oise Dumas; Jacqueline Mahutea πŸ“‚ Article πŸ“… 1995 πŸ› Elsevier Science 🌐 English βš– 232 KB

R )-l-phenylethylamine-induced cyclization of ketoenoate 2 4 led to a 2:1 mixture of "all-cis" polycyclic adducts 2 5 and 2 6, structurally related to the taxane series. Ten years ago, we reported that chiral imines 3, derived from racemic 2-alkylcyclanones 1 and optically active 1-phenylethylamine