Protection of hydroxy function with 1-N-aryl-4-alkoxy-piperidin-4-yl
申请人:Kings College London
公开号:US05436331A1
公开(公告)日:1995-07-25
A process for protecting the 2'-hydroxyl of a nucleoside, which can then be used in the chemical synthesis of polyribonucleotides, comprising the reacting of a protected nucleoside of formula I ##STR1## wherein B is a nucleoside heterocyclic base and R' is a hydroxyl-protecting group, with 1-N-aryl-4-alkoxy-1,2,5,6-tetrahydropiperidine of formula II ##STR2## wherein Ar is an aryl group possessing an electron-withdrawing substituent which renders said protecting group acid labile and R is C.sub.1 -C.sub.4 alkyl, in the presence of an acid catalyst and a solvent to yield the compound of formula II below: ##STR3##
DYE FOR PHOTOELECTRIC CONVERSION, SEMICONDUCTOR ELECTRODE, PHOTOELECTRIC CONVERSION ELEMENT, SOLAR CELL, AND NOVEL PYRROLINE-BASED COMPOUND
申请人:Maeda Katsumi
公开号:US20130118570A1
公开(公告)日:2013-05-16
Provided is a dye for photoelectric conversion containing at least one or more kind of a compound represented by the following General Formula (1) (in Formula (1), R
1
and R
2
represent any one of —CN, —SO
2
R, —COOR, and —CONR
2
(R represents a hydrogen atom, a substituted or unsubstituted alkyl group, a cycloalkyl group, or an aryl group); R
3
represents a direct bond or a substituted or unsubstituted alkylene group; X represents an acidic group; and D represents an organic group having an electron donating substituent or a substituted or unsubstituted heterocyclic group).
Cerium(IV) ammoniumnitrate (CAN) catalyzed facile and efficient aza-Michael addition of aromatic and aliphatic amines with α,β-unsaturated electrophiles in the absence of solvent under ultrasound irradiation.