第一代氟DEAD试剂双(全氟己基乙基)偶氮二羧酸酯(C 6 F 13(CH 2)2 O 2 CN NCO 2(CH 2)2 C 6 F 13,F-DEAD-1)已证明相对于偶氮二羧酸二异丙酯表现不佳在困难的Mitsunobu反应中,涉及受阻醇或酸性较低的亲核试剂(苯酚)。两种带有丙烯间隔基而不是乙烯间隔基的新型第二代含氟试剂在扩大了反应范围的同时还保留了易于分离的氟的特征。“半氟”试剂全氟辛基丙基叔酸的副产物偶氮二羧酸丁酯(C 8 F 17(CH 2)3 O 2 CN NCO 2 t可以通过荧光快速色谱法除去Bu,F-DEAD-2),以及双(全氟己基丙基)偶氮二羧酸酯(C 6 F 13(CH 2)3 O 2 CN NCO 2(CH 2)3 C 6 F 13, F-DEAD-3)可通过氟固相萃取除去。新试剂有望为Mitsunobu反应中的分离问题提供通用和补充的解决方案,而不会限制反应范围。
DIVERSITY-ORIENTED SYNTHESIS OF N,N,O-TRISUBSTITUTED HYDROXYLAMINES FROM ALCOHOLS AND AMINES BY N-O BOND FORMATION
申请人:University of Georgia Research Foundation, Inc.
公开号:US20210363098A1
公开(公告)日:2021-11-25
In one aspect, the disclosure relates to a method for the direct synthesis of complex N,N,O-trisubstituted hydroxylamines by N—O bond formation. In another aspect, the method can successfully be employed using a wide variety of commercially available alcohols and secondary amines and enables the construction of large fragment-based libraries of trisubstituted hydroxylamines for drug discovery purposes. Also disclosed are N,N,O-trisubstituted hydroxylamines having low basicity, high stability at ambient temperatures, and an inherent lack of reactivity towards acetylating and sulfonylating enzymes that confer mutagenicity on less-substituted hydroxylamines.
Enantioselective alpha-fluorination of aldehydes using chiral organic catalysts
申请人:MacMillan W.C. David
公开号:US20060189830A1
公开(公告)日:2006-08-24
Nonmetallic, chiral organic catalysts are used to catalyze enantioselective fluorination of enolizable aldehydes. Reaction systems composed of an enolizable aldehyde, an electrophilic fluorination reagent, and a nonmetallic chiral catalyst in the form of an imidazolidinone salt are also provided.
ACETAL COMPOUNDS AND THEIR PREPARATION, POLYMERS, RESIST COMPOSITIONS AND PATTERNING PROCESS
申请人:HASEGAWA Koji
公开号:US20100136485A1
公开(公告)日:2010-06-03
An acetal compound of formula (1) is provided wherein R
1
is H, methyl or trifluoromethyl, R
2
is a monovalent C
1
-C
10
hydrocarbon group, R
3
and R
4
are H or a monovalent C
1
-C
10
hydrocarbon group, R
2
and R
3
may together form an aliphatic hydrocarbon ring, and X
1
is a single bond or a divalent C
1
-C
4
hydrocarbon group. A polymer comprising recurring units derived from the acetal compound is used as a base resin to formulate a resist composition which exhibits a high resolution when processed by micropatterning technology, especially ArF lithography.
The present invention provides for compounds of formula (I)
wherein R
1
, R
2
, R
3
, R
4
, and R
5
have any of the values defined in the specification, and pharmaceutically acceptable salts thereof, that are useful as agents in the treatment of diseases and conditions, including inflammatory diseases, cancer, and AIDS. Also provided are pharmaceutical compositions comprising one or more compounds of formula (I).
An optical sensor for a blood constituent of interest comprising:
a gas permeable, crosslinked silicone polymeric matrix having at least one optical indicator therein for providing an optical signal in response to excitation light when in the presence of a blood constituent of interest, said one optical indicator consisting essentially of a mixture of derivatives of a polynuclear aromatic compound.