[EN] SUBSTITUTED BENZOPYRANS AS SELECTIVE ESTROGEN RECEPTOR-BETA AGONISTS [FR] BENZOPYRANES SUBSTITUES EN TANT QU'AGONISTES SELECTIFS DU RECEPTEUR BETA DE L'OESTROGENE
A Facile, General Approach to the Synthesis of Electrophilic Acetone Equivalents
摘要:
The facile, high-yielding, yet general synthesis of electrophilic chloroacetone equivalents 11a-f is described. The enol ethers are assembled in three steps starting with trichloride 29 in overall yields of 57-93%. Nucleophilic displacement of the chloromethyl chlorine with a range of organometallic reagents generates dichlorides 30 in yields of 58-99%, which can be dehydrohalogenated with t-BuOK/THF in yields of 87-99% to produce enol ethers 31. Conversion of the allyl chlorides 31 to the corresponding allyl iodides 11 with 72-99% yield completes the synthetic sequence. The entire sequence can be performed in less than 48 h on a >50 mmol scale.
This invention relates to novel heterocycles which are antagonists at the melanin-concentrating hormone receptor 1 (MCHR1), also referred to as 11 CBy, to pharmaceutical compositions containing them, to processes for their preparation, and to their use in medicines. Compounds of the invention have the formula:
Asymmetric synthesis of (+)-castanospermine through enol ether metathesis–hydroboration/oxidation
作者:Julien Ceccon、Grégory Danoun、Andrew E. Greene、Jean-François Poisson
DOI:10.1039/b901488h
日期:——
An asymmetric synthesis of (+)-castanospermine is presented in which enolether metathesis–hydroboration/oxidation is used for stereoselective installation of the trans-transhydroxyl groups on the piperidine ring of the alkaloid.
Investigations of an annulation-fragmentation-spirocyclisation approach to fawcettimine-type Lycopodium alkaloids
作者:Kang Yee Seah、Jeremy Robertson
DOI:10.1016/j.tet.2019.130661
日期:2019.11
β-elimination. The stereochemistry of 1,4-addition of cyanide to the resulting enone is discussed with supporting molecular modelling calculations. N-Deprotection is shown to be accompanied by cyclisation onto the nitrile group, resulting in a tricyclic lactam with a twisted amide functionality. Elaboration of this lactam afforded four of the five rings present in lycopladine D with just the C(8) carbon lacking
A new preparation of highly functionaized aromatic and heteroaromatic zinc and copper organometallics
作者:Tahir N. Majid、Paul Knochel
DOI:10.1016/s0040-4039(00)97635-4
日期:1990.1
Functionalized aromatic iodides possessing an ester, cyano, chloride or keto group can be converted to arylzinc iodides by reaction with zinc in DMF or DMAC. After transmetallation to the corresponding arylcopper, they react with several electrophiles such as enongs, allylic halides and benzoyl chloride to afford highly functionalized aromatic compounds. Extension to the preparation of polyfunctionalized