Highly Stereoselective Synthesis of Trisubstituted<i>γ</i>,<i>δ</i>-Unsaturated Acid and Aldehyde<i>via</i>Ketal Claisen Rearrangement
作者:Hisao Takayanagi、Yasuhiro Morinaka
DOI:10.1246/cl.1995.565
日期:1995.7
A new sequence for the highly stereoselective (E>99%) synthesis of a trisubstituted γ,δ-unsaturated acid (3), which consists of a ketal Claisen rearrangement of a terpene allylicalcohol with 2,2-dimethoxy-3-methyl-3-butanol and a subsequent oxidative cleavage of the resulting α-ketol, is applicable even to the preparation of 3 which is difficult to synthesize by traditional methods. The related procedure
Enantioselective Synthesis and Absolute Configuration of (+)-Cubitene
作者:Mitsuaki Kodama、Hana Maeda、Hideaki Hioki
DOI:10.1246/cl.1996.809
日期:1996.9
Enantioselectivesynthesis of (+)-(8R,10R)-cubitene has been achieved starting from D-mannitol and the absoluteconfiguration of natural cubitene isolated from termites has been determined to be 8R, 10R.
L'invention concerne des compositions de 1,1,1-trichloroéthane stabilisées contenant un nitroalcane et du 2-méthyl-2,3-époxybutane.
Ces compositions conviennent bien pour dégraisser des pièces métalliques mouillées d'huiles de coupe.
L'invention concerne des compositions de solvants chlorés tels que le 1,1,1-trichloréthane stabilisées au moyen d'un composé hétérocyclique contenant des unités oxaziridi- nes tel que la 2-tert-butyloxaziridine.
The present invention provides novel acyclic terpenes of the formula:
which are useful as intermediates for the industrially advantageous production of sarcophytol A.