Gold-Catalyzed Oxidative Arylations of 3-Butyn-1-ols and 2-Propyn-1-ols with Nitrones to Yield Distinct Fused Indoles Bearing a Heterocyclic Ring
作者:Rajkumar Lalji Sahani、Rai-Shung Liu
DOI:10.1021/acscatal.9b01491
日期:2019.7.5
The catalytic formation of various fused indoles from the nitrone oxidations of 1-substituted n-yn-1-ols (n = 2, 3) is described. For 3-butyn-1-ols, the oxidations yield tetrahydropyrano[4,3-b]indoles, whereas 2-propynols deliver tetrahydro-[1,2]oxazino[5,4-b]indoles efficiently. When styryl nitrones were tested on 2-propyn-1-ols, dihydrooxazolo[3,4-a]indoles were produced efficiently. We postulate
描述了由1-取代的n -yn-1-ols(n = 2,3)的硝酮氧化催化形成各种稠合吲哚的方法。对于3-丁炔-1-醇,氧化产生四氢吡喃并[4,3- b ]吲哚,而2-丙炔醇有效地递送四氢-[1,2]恶嗪基[5,4- b ]吲哚。当在2-丙炔-1-醇上测试苯乙烯基硝酮时,可以高效地生产二氢恶唑并[3,4- a ]吲哚。我们假定这些稠合的吲哚的形成是由共同的机理引起的,该机制涉及在这些稠合的吲哚之前,初始的烯基金中间体的[3,3]-σ位移以提供羰基化作用。
The present invention relates to compounds of formula (I), in which formula X is hydrogen or hydroxy or protected hydroxy; R1 an R2 stand for hydrogen, methyl or ethyl, or, when taken together with the carbon atom bearing the group X, R1 and R2 can form a C3-C5 carbocyclic ring; Q is a C3-C6 hydrocarbylene, hydrocarbylene indicating the diradical obtained after removal of 2 hydrogen atoms for a straight or banched, saturated or unsaturated hydrocarbon, in which one of any CH2 groups may optionally be replaced by an oxygen atom or a carbonyl group, such that the carbon atom (C-22) directly bonded to C-20 is an sp2 or sp3 hybridized carbon atom, i.e. bonded to 2 or 3 other atoms; and in which another of the CH2 groups may be replaced by phenylene, and where Q may optionally be substituted with one or more hydroxy or C1-C4-alkoxy groups. These compounds have been discovered to possess exceptionally high immunosuppressive activites together with high tumour cell proliferation inhibiting activities.
9-Allenyl-9-BBN: A new reagent for the efficient allenylboration of carbonyl compounds producing the homopropargylic alcohols in high purity and yield
作者:Herbert C. Brown、Uday R. Khire、Uday S. Racherla
DOI:10.1016/s0040-4039(00)60046-1
日期:1993.1
A new reagent, 9-allenyl-9-BBN (1), has been developed for the convenient and efficient synthesis of a variety of homopropargylic alcohols via the
已经开发出一种新的试剂9-烯丙基-9-BBN(1),该试剂可通过以下方法方便高效地合成多种均丙醇:
Synth�se d'alcools ac�tyl�niques par alkylation d'hydroxy-?-alkynes-1
作者:Jacques Flahaut、Philippe Miginiac
DOI:10.1002/hlca.19780610635
日期:1978.9.20
Synthesis of acetylenic alcohols by alkylation of ω‐hydroxy‐1‐alkynesIn liquid ammonia and with lithium amide, the alkylation of an ω‐hydroxyl‐alkyne proceeds with good yield with primary or secondary alcohols and with fair yield with tertiary alcohols. It is a very convenient way to prepare many substituted acetylenic alcohols.