已经开发出第一个钯催化的仲醇对映选择性氧化反应,利用容易获得的二胺(-)-金雀花石作为手性配体,分子氧作为化学计量氧化剂。关于碱基和氢键供体作用的机制见解导致了对原始系统的一些改进。也就是说,碳酸铯和叔丁醇的添加大大提高了反应速率,促进了快速分辨率。使用氯仿作为溶剂允许在 23 °C 下使用环境空气作为终端氧化剂,从而提高催化剂选择性。这些改进的反应条件使得能够以良好至优异的选择性因子成功地将苄基、烯丙基和环丙基仲醇动力学拆分为高对映体过量。该催化剂体系也已应用于内消旋二醇的去对称化,提供高产率的对映体富集的羟基酮。
BITTER TASTE MODIFIERS INCLUDING SUBSTITUTED 1-BENZYL-3-(1-(ISOXAZOL-4-YLMETHYL)-1H-PYRAZOL-4-YL)IMIDAZOLIDINE-2,4-DIONES AND COMPOSITIONS THEREOF
申请人:SENOMYX, INC.
公开号:US20160376263A1
公开(公告)日:2016-12-29
The present invention includes compounds and compositions known to modify the perception of bitter taste, and combinations of said compositions and compounds with additional compositions, compounds, and products. Exemplary compositions comprise one or more of the following: cooling agents; inactive drug ingredients; active pharmaceutical ingredients; food additives or foodstuffs; flavorants, or flavor enhancers; food or beverage products; bitter compounds; sweeteners; bitterants; sour flavorants; salty flavorants; umami flavorants; plant or animal products; compounds known to be used in pet care products; compounds known to be used in personal care products; compounds known to be used in home products; pharmaceutical preparations; topical preparations; cannabis-derived or cannabis-related products; compounds known to be used in oral care products; beverages; scents, perfumes, or odorants; compounds known to be used in consumer products; silicone compounds; abrasives; surfactants; warming agents; smoking articles; fats, oils, or emulsions; and/or probiotic bacteria or supplements.
Construction of polycyclic structures with vicinal all-carbon quaternary stereocenters <i>via</i> an enantioselective photoenolization/Diels–Alder reaction
present in one molecule, they will dramatically increase its synthetic challenge. A chiral titanium promoted enantioselective photoenolization/Diels–Alder (PEDA) reaction allows largely stereohindered tetra-substituted dienophiles to interact with highly active photoenolized hydroxy-o-quinodimethanes, delivering fused or spiro polycyclic rings bearing vicinal all-carbon quaternary centers in excellent
SUBSTITUTED VINYL AND ALKINYL CYCLOHEXENOLS AS ACTIVE AGENTS AGAINST ABIOTIC STRESS IN PLANTS
申请人:Frackenpohl Jens
公开号:US20140080704A1
公开(公告)日:2014-03-20
The invention relates to substituted vinyl- and alkynylcyclohexenols of the general formula (I) and salts thereof
where the R
1
, R
2
, R
3
, R
4
, R
5
, [X—Y] and Q radicals are each as defined in the description, to processes for preparation thereof and to the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.
Compounds disclosed herein including compounds of formula I′:
and salts thereof are provided. Pharmaceutical compositions comprising compounds disclosed herein, processes for preparing compounds disclosed herein, intermediates useful for preparing compounds disclosed herein and therapeutic methods for treating an HIV infection using compounds disclosed herein are also provided.
SUBSTITUTED VINYL AND ALKYNYL CYANOCYCLOALKANOLS AND VINYL AND ALKYNYL CYANOHETEROCYCLOALKANOLS AS ACTIVE AGENTS AGAINST ABIOTIC PLANT STRESS
申请人:BAYER CROPSCIENCE AKTIENGESELLSCHAFT
公开号:US20170197910A1
公开(公告)日:2017-07-13
Substituted vinyl- and alkynylcyanocycloalkanols and vinyl- and alkynylcyanoheterocyclylalkanols of the general formula (I) or salts thereof
where
[X—Y], Q, R
1
, R
2
, A
1
, A
2
, V, W, m and n are each as defined in the description, processes for preparation thereof and the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.