A Concise Preparation of Yuehchukene and Its Analogues
摘要:
The palladium catalyzed carbonylative cross-coupling reaction of indolylborates (2) with vinyl triflates (3) afforded indol-2-yl ketones (4), which were subsequently converted to hexahydroindeno[2,1-b]indoles (5) with the aid of an acid. This protocol was well adapted for the total synthesis of yuehchukene.
A Concise Preparation of Yuehchukene and Its Analogues
摘要:
The palladium catalyzed carbonylative cross-coupling reaction of indolylborates (2) with vinyl triflates (3) afforded indol-2-yl ketones (4), which were subsequently converted to hexahydroindeno[2,1-b]indoles (5) with the aid of an acid. This protocol was well adapted for the total synthesis of yuehchukene.
Provided is a highly efficient method for the production of aldehydes and ketones, which is inexpensive, exhibits high reactivity, and is capable of easy separation of byproduct after the reaction. More particularly, there is provided a method for producing an aldehyde or a ketone, comprising at least an oxidation step of oxidizing a primary alcohol or a secondary alcohol in the presence of a polymeric carbodiimide represented by the following formula (1) and having a weight-average molecular weight of 300 to 5000, and a sulfoxide compound, together with an acid and a base, or together with a salt of the acid and the base.
significant directive effect of the 2-axial hydroxy group appeared in the LiAlH4, NaBH4, and Zn(BH4)2 reduction of cyclohexanone, while the 3-axial hydroxy group exhibited a steric hindrance. The distance between the carbonyl carbon and the hydroxy group which interacts with the hydride reagent is mainly responsible for such a difference. In the reduction of Na[B(OAc)3H], both the 2- and 3-axial hydroxycyclohexanones
REGIOCHEMICAL CONTROL IN THE 1,2-CARBONYL TRANSPOSITION OF α,α′-DIMETHYLENE SYSTEMS THROUGH REGIOSELECTIVE SULFENYLATION OF TOSYLHYDRAZONE DIANIONS
作者:Tetsuya Mimura、Takeshi Nakai
DOI:10.1246/cl.1980.931
日期:1980.8.5
The regiochemical outcomes are described in the 1,2-carbonyl shift of α,α′-dimethylene systems which relies upon the regioselective sulfenylation of tosylhydrazone dianions leading to the enol thioethers of transposed ketones. Notably, a high regiospecificity was obtained with β-methyl- and β,β-dimethylcyclohexanone without any attempts to separate the stereoisomers of the hydrazones.
Novel rapamycin analogues and methods for their production with FKBP and/or MIP inhibitory activity with reduced mTOR inhibitory activity with therapeutic potential e.g. as bacterial virulence inhibitors.
N-(Azolyl-1-äth-1'-yl)-halogenacetanilide, ihre Herstellung und ihre Verwendung als Herbizide
申请人:CIBA-GEIGY AG
公开号:EP0029011A1
公开(公告)日:1981-05-20
N-Azolyl-1- äthyl-N-halogenacetanilide der Formel I
worin A einen über ein Stickstoffatom gebundenen, gegebenenfalls durch C1-C4 Alkyl, Cyano oder Halogen substituierten Azolring, X Chlor oder Brom und mindestens einer der Substituenten R1, R2 und R3, C1-C4 Alkoxy, Halogen oder Halogenmethyl, die anderen auch Wasserstoff oder C1-C4 Alkyl bedeuten und deren Säureadditionssalze haben herbizide und das Pflanzenwachstum hemmende Eigenschaften. Sie eignen sich zum Einsatz als Selektivherbizide in Kulturpflanzungen.
式 I 的 N-唑基-1-乙基-N-卤代乙酰苯胺
其中 A 是通过氮原子键合的唑环,可选被 C1-C4 烷基、氰基或卤素取代,X 是氯或溴,取代基 R1、R2 和 R3 中至少有一个是 C1-C4 烷氧基、卤素或卤代甲基,其它也是氢或 C1-C4 烷基,它们的酸加成盐具有除草和抑制植物生长的特性。它们适合用作作物的选择性除草剂。