A practical deca-gram scale ring expansion of (R)-(−)-carvone to (R)-(+)-3-methyl-6-isopropenyl-cyclohept-3-enone-1
作者:Leandro de C. Alves、André L. Desiderá、Kleber T. de Oliveira、Sean Newton、Steven V. Ley、Timothy J. Brocksom
DOI:10.1039/c5ob00525f
日期:——
A route to enantiopure (R)-(+)-3-methyl-6-isopropenyl-cyclohept-3-enone-1, an intermediate for terpenoids, has been developed and includes a highly chemo- and regioselective Tiffeneau–Demjanov reaction. Starting from readily available (R)-(−)-carvone, this robust sequence is available on a deca-gram scale and uses flow chemistry for the initial epoxidation reaction. The stereochemistry of the addition
On the Mechanism of Pd(O) Catalyzed Formation of Oxazolidin-2-ones from Vinyl Epoxides
作者:Barry M. Trost、Rudolf Hurnaus
DOI:10.1016/s0040-4039(00)99277-3
日期:1989.1
Continuous Flow Synthesis of Terminal Epoxides from Ketones Using in Situ Generated Bromomethyl Lithium
作者:Timo von Keutz、David Cantillo、C. Oliver Kappe
DOI:10.1021/acs.orglett.9b04072
日期:2019.12.20
preparation of epoxidesfrom ketones has been developed. The method is based on the carefully controlled generation of (bromomethyl)lithium (LiCH2Br) from inexpensive CH2Br2 and MeLi in a continuous flow reactor. The reaction has shown excellent selectivity for a variety of substrates, including α-chloroketones, which typically fail under classic Corey-Chaykovsky conditions. This advantage has been used to develop
Conjugated Dienes as Prohaptens in Contact Allergy: In Vivo and in Vitro Studies of Structure−Activity Relationships, Sensitizing Capacity, and Metabolic Activation
作者:Moa Andresen Bergström、Kristina Luthman、J. Lars G. Nilsson、Ann-Therese Karlberg
DOI:10.1021/tx060006n
日期:2006.6.1
alpha-terpinene were demonstrated to be prohaptens able to induce contact allergy. The difference in sensitizing capacity of conjugated dienes as compared to alkenes with isolated doublebonds was found to be due to the high reactivity and sensitizing capacity of the allylic epoxides metabolically formed from conjugated dienes. We recommend that these structure-activity relationship rules are incorporated into