摘要:

Foresaconitin, the Main Alkaloid from the Roots ofAconitum forestiiStapfForesaconitin (1) was isolated as the main alkaloid (0.2%) from the roots ofAconitum ForestiiStapf and identified as the 8‐O‐acetyl‐14‐O‐(4‐methoxybenzoyl) derivative of 8β, 14α‐dihydroxy‐ 1α, 6α, 16β‐trimethoxy‐4β‐(methoxymethyl)acon

ISSN:0009-2940    

DOI:10.1002/cber.19811140142

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

Contributions to the Chemistry of Boron, 1141)A Convenient Synthesis of Diboron TetrabromideTetramethoxydiborane (4) and boron tribromide react at ambient temperature with formation of diboron tetrabromide (yield 50%), methyl bromide and diboron trioxide. This makes B2Br4readily accessible for further studies.

ISSN:0009-2940    

DOI:10.1002/cber.19811140143

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

Deamination Reactions, 341)Diels‐Alder Reactions of Methoxycyclopentadiene, a Route to 1‐Methoxynorbornane‐2‐diazonium IonsA Mixture of 1‐ and 2 ‐methoxycyclopentadiene (7,8) was prepared in four steps from cyclopentadiene. Diels‐Alder reaction of7+8with methyl acrylate produces a mixture of adducts from which the 1‐methoxy isomers (9,11) were obtained by distillation. Separation by way of the iodo lactone20, hydrogenation, and Curtius degradation affordedendo‐ andexo‐1‐methoxy‐2‐norbornylamin (14,17) Nitrous acid deaminations of14yielded norpinan‐2‐one (21) and norbornan‐2‐one (22) in a 3:7 ratio whereas17gave22only. The results of the deamination reactions confirm the position of the methoxy groups and illustrate the superiority of diazonium precursors in the no

ISSN:0009-2940    

DOI:10.1002/cber.19811140144

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

Synthesis and Properties of β‐Oxopropanephostones and ‐phostamesThe 1,2‐oxaphospholan‐4‐ones5and 1,2‐azaphospholidin‐4‐ones6have been prepared by ester condensation. Most of the compounds are highly enolised, their pKavalues range

ISSN:0009-2940    

DOI:10.1002/cber.19811140145

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

ISSN:0009-2940    

DOI:10.1002/cber.19811140101

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY