Chiral synthesis of polyketide-derived natural products. 44. Large Laboratory scale Synthesis of (2S,3S)-2-(4-Methoxybenzyloxy)-3,4-O-(3-pentylidene)-1,3,4-butantriol, a Versatile Chiral Building Block in Natural Product Synthesis.
Synthesis of Enantiomerically Pure Cyclopropanes from Cyclopropylboronic Acids
作者:Joachim E. A. Luithle、Jörg Pietruszka
DOI:10.1021/jo9910278
日期:1999.10.1
is described. Various, highly stable, enantiomericallypure alkenylboronic esters 13 have been conveniently synthesized by the direct hydroboration of alkynes 11 using the new chiral 1,3,2-dioxaborolane 15. The high stability was also demonstrated by the selective deprotection of a tert-butyldimethylsilyl protecting group without hydrolyzing the boronic ester. The diastereoselective cyclopropanation
Microwave assisted synthesis of enantiomerically pure allylboronates
作者:Vesna Cmrecki、Nils C. Eichenauer、Wolfgang Frey、Jörg Pietruszka
DOI:10.1016/j.tet.2010.04.100
日期:2010.8
Stable allylboronates with a stereogenic centre α to the boronic ester moiety represent versatile reagents for stereoselective synthesis of homoallylic alcohols. Use of microwave irradiation in desilylation and sigmatropic rearrangement reactions allows rapid synthesis of α-chiral allylboronates utilized in the highly diastereo- and enantioselective synthesis of (Z)-configured homoallylic α-hydroxy
Chiral synthesis of polyketide-derived natural products. 44. Large Laboratory scale Synthesis of (2S,3S)-2-(4-Methoxybenzyloxy)-3,4-O-(3-pentylidene)-1,3,4-butantriol, a Versatile Chiral Building Block in Natural Product Synthesis.
(2S, 3S)-2-(4-Methoxybenzyloxy)-3, 4-O-(3-pentylidene)-1, 3, 4-butanetriol (3), a versatile chiral building block for an essential structural unit of complex natural products, was synthesized starting from dimethyl L-(+)-tartrate (5) on both a small scale and a large scale in good yield.
Diastereoselective Addition of Chiral (2-Lithiophenyl)acetaldehyde Acetals to Various Imines as Key Step in the Asymmetric Synthesis of 1-Aryltetrahydroisoquinolines, Part 4
A novel asymmetricsynthesis of 1-aryl-1,2,3,4-tetrahydroisoquinolines has been developed. The key step in this synthesis is the diastereoselective addition of homochiral (2-lithiophenyl)acetaldehyde acetals to the sulfonylimine 25 and to the arylimines 28 and 31. The best diastereoselectivity is obtained by addition of the bis(2-methoxypropan-2-yl)-substituted 1,3-dioxolane 6e to benzylidene-p-anisidine
[EN] GLUCOSE-SENSITIVE PEPTIDE HORMONES<br/>[FR] HORMONES PEPTIDIQUES SENSIBLES AU GLUCOSE
申请人:GUBRA APS
公开号:WO2019243576A1
公开(公告)日:2019-12-26
The present invention relates to a conjugate of the formula P-L-I, wherein P is a peptide hormone effecting the metabolism of carbohydrates in vivo, L is a hydrolysable linker molecule consisting of Lp and Lj, and I is a molecule capable of inhibiting the effect of the peptide hormone P on the metabolism of carbohydrates in vivo. Under in vivo conditions, the conjugate is the major compound. When the concentration of glucose increases in v/vo,the concentration of the peptide hormone effecting the metabolism of carbohydrates in vivo also increases.