Efficient acetalisation of aldehydes catalyzed by titanium tetrachloride in a basic medium
作者:Angelo Clerici、Nadia Pastori、Ombretta Porta
DOI:10.1016/s0040-4020(98)00982-x
日期:1998.12
The acetalisation of aliphatic and aromatic aldehydes is achieved in a basic medium by using catalytic amount of Ti(IV) chloride in MeOH in the presence of NH3 or Et3N. The present protocol shows many advantages over the well known base or acid catalysis: in fact, in contrast to base-promoted acetalisation, aldehydes with electron-rich carbonyl groups react easily, enolizable aldehydes do not undergo
Ethylaluminium Dichloride Induced Reactions of Acetals with Unsaturated Carboxylic Esters: Synthesis of Homoallyl Ethers
作者:Jürgen O. Metzger、Ursula Biermann
DOI:10.1002/jlac.199619961119
日期:1996.11
The ethylaluminium dichloride induced reactions of methyl 10-undecenoate (1) with dimethyl acetals of formaldehyde 2a, acetaldehyde 2b, isobutyraldehyde 2c, and pivaldehyde 2d gave the corresponding homoallyl ethers 3a, 3b, 3c, and 3d in yields of 48–70%. The products were obtained as mixtures of the (E) and (Z) stereoisomers. With formaldehyde dimethyl acetal (2a), methyl oleate (6), and methyl petroselinate
TRANS-3,5-DISUBSTITUTEDPYRROLIDINE: ORGANOCATALYST FOR anti-MANNICH REACTIONS
申请人:Tanaka Fujie
公开号:US20070117986A1
公开(公告)日:2007-05-24
A compound of Formula I is disclosed, in which R is a substituent containing a hydrogen bond-forming atom within three atoms from the ring carbon to which the substituent is bonded; X is CH
2
, O, S or NR
1
, wherein R
1
is a hydrocarbyl group or an amino-protecting group having one to about 18 carbon atoms; R
2
is hydrido or a hydrocarbyl group containing one to about twelve carbon atoms; and R
3
is hydrido or methyl, but both R
2
and R
3
are not hydrido when X is CH
2
A molecule of Formula I and those in which R
2
and R
3
can both be hydrido (Formula X) functions as a catalyst in a Mannich reaction to asymmetrically form β-aminoaldehyde or β-aminoketone diastereomeric products having two chiral centers on adjacent carbon atoms and in which the anti-diastereomers are in excess over the syn-diastereomers. Methods for carrying out those syntheses are also disclosed.
TUMOR-TARGETING EVALUATION METHODOLOGY AND COMPOUNDS RELATED THERETO
申请人:GOURDEAU Henriette
公开号:US20090062255A1
公开(公告)日:2009-03-05
The invention relates to a method for evaluating a chemotherapeutic potential of a candidate molecule. In evaluating the candidate molecule, the candidate molecule is tested for its ability to inhibit the in vitro growth of a cancer cell; to bind a cellular receptor produced by a cancer cell, wherein said receptor, such as a peripheral benzodiazepine receptor, is produced in a greater amount by said cancer cell than by a normal cell; and to inhibit the activity of at least one protein member of the MAPK pathway. The invention further relates to dibenzodiazepinone analogues and derivatives thereof.
Herein we report that a single frustratedLewispair (FLP) catalyst can promote the reductive etherification of aldehydes and ketones. The reaction does not require an exogenous acid catalyst, but the combined action of FLP on H2, R‐OH or H2O generates the required Brønsted acid in a reversible, “turn on” manner. The method is not only a complementary metal‐free reductive etherification, but also a niche