Condensation of alkyl allyl (and 3-methyl-3-butenyl) phosphorochloridates with dialkyl phosphates gave trialkyl allyl (and 3-methyl-3-butenyl) pyrophosphates. Reactions of crotyl (2-butenyl) pyrophosphates with various nucleophiles such as phenolic ethers, aromatic amines, and nitrogen-containing heterocycles in the presence of boron trifluoride etherate gave good to moderate yields of crotylated products. The
[EN] METHOD OF PREPARING A DON PRODRUG FROM L-GLUTAMIC ACID<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN PROMÉDICAMENT DON À PARTIR D'ACIDE L-GLUTAMIQUE
申请人:DRACEN PHARMACEUTICALS INC
公开号:WO2020167831A1
公开(公告)日:2020-08-20
The present disclosure provides methods of preparing a compound of Formula (1): wherein R1, R2, and R3 are as defined as set forth in the application. In one embodiment, a compound of Formula (1) is prepared in >95% chemical purity and >95% enantiomeric excess.
The present invention provides a novel amino acid derivative, and a salt for thereof. The present invention further provides a sweetening agent and a food or beverage, which contains the novel amino acid derivative of the present invention to increase the sweetness of the same.
chemo- (C vs. N: >99%; C2 vs. C3: >98%), regio- (linear vs. branch: >99%), and stereo-selectivity (E vs. Z: >99%) and functional group tolerance. The use of water not only provides sustainability by eliminating the need for organic solvent as reaction media but it also activates allylic alcohols via hydrogen bond networking and stabilizes the consequent hydroxide ion (strong solvation effect) resulting
本文报道了在温和条件下使用烯丙醇对 (NH)-吲哚进行“水中”镍催化的化学选择性C 3烯丙基化反应。发现不同的吲哚和烯丙醇与优异的化学-(C 对 N:>99%;C 2 对 C 3:>98%)、区域-(线性对分支:>99%)和立体-相容选择性(E vs. Z:>99%)和官能团耐受性。水的使用不仅通过消除对有机溶剂作为反应介质的需要来提供可持续性,而且还通过活化烯丙醇氢键网络并稳定随后的氢氧根离子(强溶剂化作用),导致容易的氧化加成,并由此形成亲电的 π-烯丙基镍络合物,导致C 3 -烯丙基吲哚。该研究进一步强调了第一个氢键辅助分子间 N → C 烯丙基通过π-烯丙基镍络合迁移,并报告了首次使用烯丙胺作为亲电前体合成烯丙基吲哚。