报道了从咪唑和二氯烷烃合成双(咪唑鎓)二氯化盐的一般方法。此处通过在DMSO 作为极性助溶剂存在下使用过量 CH 2 Cl 2来解决此反应对形成亚甲基桥接衍生物的典型限制,这可能是通过稳定初始 S N 2 转变显着提高转化率状态。该方法还被证明适用于从吡啶衍生物形成双(吡啶鎓)二氯化物盐,以及从咪唑直接合成金属-双(NHC)配合物。
报道了从咪唑和二氯烷烃合成双(咪唑鎓)二氯化盐的一般方法。此处通过在DMSO 作为极性助溶剂存在下使用过量 CH 2 Cl 2来解决此反应对形成亚甲基桥接衍生物的典型限制,这可能是通过稳定初始 S N 2 转变显着提高转化率状态。该方法还被证明适用于从吡啶衍生物形成双(吡啶鎓)二氯化物盐,以及从咪唑直接合成金属-双(NHC)配合物。
Palladium-Catalyzed Dehydrative Cross-Coupling of Allylic Alcohols and <i>N</i>-Heterocycles Promoted by a Bicyclic Bridgehead Phosphoramidite Ligand and an Acid Additive
作者:Kyungjun Kang、Jaewook Kim、Ansoo Lee、Woo Youn Kim、Hyunwoo Kim
DOI:10.1021/acs.orglett.6b00001
日期:2016.2.5
A mild and efficient dehydrative cross-coupling reaction between allylic alcohols and N-heterocycles using palladium catalysis is reported. A bicyclic bridgehead phosphoramidite (briphos) ligand together with Pd(dba)2 is a highly efficient catalyst, and an acid additive involved in the rate-determining step promotes the catalytic cycle. The coupling reaction of allylic alcohols with N-heterocycles
Disclosed are compounds having the ability to inhibit cytochrome P450 2A6, 2A13, and/or 2B6 and tobacco products comprising them. Also disclosed are pharmaceutical compositions comprising them.
A method of modulating a stability of a sulfonated dye, particularly its ozonefastness. The method comprises providing a salt of the dye, wherein the salt comprises at least one organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
R
p
, R
q
and R
r
are each independently selected from a C
1-6
alkyl group;
s is 0, 1, 2 or 3; and
Ar is a C
6-12
aryl group or C
3-12
heteroaryl group.
A salt of a sulfonated dye modulates a stability of the dye, particularly its ozonefastness. The salt comprises an organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
Rp, Rq and Rr are each independently selected from a C1-6 alkyl group;
s is 0, 1, 2 or 3; and
Ar is a C6-12 aryl group or C3-12 heteroaryl group.
A method of modulating a stability of a sulfonated dye, particularly its ozonefastness is provided. The method comprises providing a salt of the dye, wherein the salt comprises at least one organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
Rp, Rq and Rr are each independently selected from a C1-6 alkyl group;
s is 0, 1, 2 or 3; and
Ar is a C6-12 aryl group or C3-12 heteroaryl group.