摘要:

Abstractα‐Peroxyamines contain the group , which may also be incorporated into a ring. Numerous compounds of this type are accessible,inter alia, from ketones, hydrogen peroxide, or alkyl hydroperoxides and ammonia, as well as by autoxidation or photo‐oxidation of amines or imines. Apart from decomposition reactions, the chemistry of these compounds is characterized by interesting cyclizations to give lactams, imides, oxaziridines, tetroxanes

ISSN:0570-0833    

DOI:10.1002/anie.197307831

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractOf the 4000 or so terpenoid natural products known today, whose carbon skeleton can be divided up into isopentane units by the “isoprene rule” (C10, monoterpenes; C15, sesquiterpenes; C20, diterpenes; C25, sesterterpenes; C30, triterpenes; steroids; carotenoids; polyprenes), the sesquiterpenes, numbering about 1000, represent the largest single class. According to the well founded concepts developed in recent years for the biogenesis of their highly diverse carbon skeletons, the present report is divided into nine sections dealing respectively with farnesanes, bicyclofarnesols (drimanes, iresanes), bisabolanes, cadinanes, humulanes and caryophyllanes, germacranes, “hydroazulenes”, selinanes and eremophilanes, and maalianes and aristolanes. Further groups of sesquiterpenes can be derived from each of these structura

ISSN:0570-0833    

DOI:10.1002/anie.197307931

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractDichloromethylenammonium salts, particularly dichloromethylenedimethylammonium chloride, occupy a unique place as stable but reactive building blocks for synthesis. They contain three mobile chlorine atoms activated by an amino group on the same carbon atom. These salts can be regarded as chlorinated Vilsmeier or Mannich reagents and are thus at a higher oxidation level. As in the Mannich or Vilsmeier reaction, the carbon condenses here as an electrophile with formation of CC or Chetero atom bonds in a variety that is still far from being exhaus

ISSN:0570-0833    

DOI:10.1002/anie.197308061

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe cycloaddition of allyl cations to conjugated dienes offers an efficient and general tool for the construction of seven‐membered carbocycles. The silver salt route is highly suitable for generating allyl cations and can be used even in most difficult cases,i. e.for elusive and intractable allyl cations such as 2‐methylallyl, 2‐methoxyallyl, and the parent allyl cation. Cycloadditions to the 2‐methoxyallyl cation come very close to the prototype of a 6π, 7C reaction, since the carbonyl group introduced into the new ring can either be used for further transformations or be removed altogether. The combination of an allyl cation with π reactants, especially conjugated dienes, is a powerful and strongly convergent synthetic method since it permits one‐step assembly, from a C3and a C4unit, of a cluster of up to four chiral centers in a ring which is larger than six‐membered. Allyl cations combine with electron‐rich 2π systems to form novel five‐membered rings. The nature of the organometallic intermediates has been elucid

ISSN:0570-0833    

DOI:10.1002/anie.197308191

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308362

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308371

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308381

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308401

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308411

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197308422

出版商:Hüthig&Wepf Verlag    

年代:1973

数据来源: WILEY