Bifurcate, tandem ATRC reactions: towards 2-oxabicyclo[4.3.0]nonane core of eunicellins
摘要:
Bifurcate, tandem ATRC reactions provide rapid access to 2-oxabicyclo[4.3.0]nonane ring system present in terpenes such as eunicellin. (c) 2005 Elsevier Ltd. All rights reserved.
provided. The C–H amination can provide the corresponding amino derivatives on a gram scale. Various methods for the cleavage of the sulfonimidoyl group to give the corresponding tert-butoxycarbonyl- or acetyl-protected optically pure amines are also described. An efficient asymmetric C–H amination of benzylic and allylic substrates, as well as of adamantane derivatives, through catalytic C–H insertion
appropriate tether securing intramolecular addition of the nitrene, the intermolecular C–H amination remains much less predictable. This study aims at addressing this issue by capitalizing on an efficient stereoselective nitrene transfer involving the combination of a chiral aminating agent 1 with a chiral rhodium catalyst 2. Allylic C–H amination of terpenes and enol ethers occurs with excellent yields as well
Insecticidal properties of monoterpenoid derivatives to the house fly (diptera: Muscidae) and red flour beetle (coleoptera: Tenebrionidae)
作者:Pamela J. Rice、Joel R. Coats
DOI:10.1002/ps.2780410305
日期:1994.7
AbstractMonoterpenoid derivatives were synthesized and their insecticidal activities were evaluated against red flour beetles, Tribolium castaneum (Herbst), in fumigant bioassays and against house flies Musca domestica (L.) in topical, fumigant, and ovicidal bioassays. Acetate derivatives and haloacetate derivatives were compared with each other, and with the parent monoterpenoid to determine structure‐activity relationships. Acetate derivatives were more active than the propionate derivatives of cyclic monoterpenoids in the topical, fumigant, and ovicidal bioassays. Pivalates were topically more insecticidal than acetates to adult house flies, while the acetates had the greater ovicidal activity. Acetates and pivalates were more effective than haloacetates in the topical, red flour beetle fumigation and ovicidal bioassays. Fluoroacetates of cyclic monoterpenoids were the most effective house fly fumigants, followed by acetates, and trichloroacetates. Several derivatives were produced that displayed enhanced activity relative to the parent alcohols or phenols.
Mousseron-Canet,M. et al., Bulletin de la Societe Chimique de France, 1964, p. 297 - 300
作者:Mousseron-Canet,M. et al.
DOI:——
日期:——
Organometallic derivatives of natural products: dicobalt hexacarbonyl complexes of geranyl-alkynes
作者:Angela Moore、Johannes Ostermann、Yannick Ortin、Michael J. McGlinchey
DOI:10.1039/c6nj00622a
日期:——
migration to form previously unknown E and Z 1-methoxy-3,7-dimethyl-1,6-octadiene in low yield. Sodium propargyl alkoxide and geranyl bromide yield propargyl geranyl ether, 13; subsequent reaction with dicobalt octacarbonyl and then bis(diphenylphosphino)methane furnishes the corresponding alkyne–Co2(CO)4(dppm) tetrahedral cluster, 16. Reaction of geranylacetone with phenylethynyl-lithium, and then with
用二铁九碳羰基处理甲基香叶基醚会导致氢迁移,从而以低收率形成以前未知的E和Z 1-甲氧基-3,7-二甲基-1,6-辛二烯。炔丙基醇钠和香叶基溴化物产生炔丙基香叶基醚,13。随后与二羰基二钴八羰基反应,然后与双(二苯基膦基)甲烷反应,得到相应的炔烃-Co 2(CO)4(dppm)四面体簇,16。香叶基丙酮与苯基乙炔基锂反应,然后与Co 2(CO)8反应形成(1-苯基-3,7,11-三甲基十二烷基-6,10-二烯-1-yn-3-醇)Co 2(CO )6,19。可以通过适当的醇与三氯乙酰氯和然后的Co 2(CO)8反应,以非常好的收率制得carbynyltricobaltnona羰基簇RC(O)CCo 3(CO)9,其中R =香叶基23或法呢基25。,或与金属稳定的离子[Co 3(CO)9 C C O] +,24反应。潜在用途的这些(η 2 -alkyne)在Pauson-Khand反应或尼古拉斯环化二钴复合物进行了讨论。