Studies an Acetylenic Compounds. XXIII. A New Ring Closure of 2-Propynyl Ethers
نویسندگان
چکیده
منابع مشابه
New acetylenic norlignan compounds from rhizomes of Curculigo crassifolia.
Two pairs of diastereoisomeric acetylenic norlignan compounds with PhCH(OR(1))CH(OR(2))CH(2)C triple bond CPh skeleta: (1R, 2R)-1-O-methylnyasicoside (1) and (1S, 2R)-1-O-methylnyasicoside (2), and (1R, 2R)-crassifogenin D (3) and (1S, 2R)- crassifogenin D (4), were isolated from the ethanolic extract of rhizomes of Curculigo crassifolia. Compounds 3 and 4 are new and their structures were eluc...
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The title compound, C(10)H(8)O(3), has been synthesized as part of our investigations into the generation of new anti-bacterial agents and serves as a building block for the synthesis of compound libraries. The compound crystallizes with two independent mol-ecules in the asymmetric unit. The transoid propynyl ester groups are coplanar with the 2-hydroxy-benzoate group with maximum deviations of...
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[formula: see text] The enantioselective total synthesis of (+)-laurencin 1 is achieved in 18 steps from (S)-(+)-4-benzyl-3-benzyloxyacetyl-2-oxazolidinone. The key steps in this synthesis are an asymmetric glycolate alkylation leading to acyl oxazolidinone 2 and a subsequent ring-closing olefin metathesis to construct the oxocene core of 1. The approach to medium ring ethers utilized in this s...
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in this work, a novel and fast method for direct analysis of volatile compounds (davc) of medicinal plants has been developed by holding a filament from different parts of a plant in the gc injection port. the extraction and analysis of volatile components of a small amount of plant were carried out in one-step without any sample preparation. after optimization of temperature, extraction time a...
Copper-catalyzed oxidative ring closure and carboarylation of 2-ethynylanilides.
A new copper-catalyzed oxidative ring closure of ethynyl anilides with diaryliodonium salts was developed for the highly modular construction of benzoxazines bearing a fully substituted exo double bond. The oxidative transformation includes an unusual 6-exo-dig cyclization step with the formation of C-O and C-C bonds.
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1962
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.10.926