Selectivities in the Reactions of Alkyl-, Aryl- and Heterosubstituted Organotitanium Compounds Preliminary Communication
作者:Beat Weidmann、Leo Widler、Alan G. Olivero、Christopher D. Maycock、Dieter Seebach
DOI:10.1002/hlca.19810640136
日期:1981.2.4
Solutions of the title compounds R-Ti(OR′)3 (1) are generally available from organolithium (or magnesium) derivatives according to equation 1. It is shown (Table 1) that some heterosubstitutedorganotitaniumcompounds are more stable thermally than their lithium counterparts. The reagents 1 are highly selective carbonylophiles (Tables 1 and 2), their reactivity can be modified by variation of the R′O-group
assignment of absolute stereochemistry, based on characteristic differences detected within each diastereomeric couple. The additional lipophilic group was tolerated by the receptor, supporting the hypothesis that the two regions described within the H3 receptor binding site can be simultaneously occupied by antagonists. Diastereoisomers with opposite chirality at the benzyliccarbon showed limited or no
Modular Generation of (Iodinated) Polyarenes Using Triethylgermane as Orthogonal Masking Group
作者:Tatjana Kreisel、Marvin Mendel、Adele E. Queen、Kristina Deckers、Daniel Hupperich、Julian Riegger、Christoph Fricke、Franziska Schoenebeck
DOI:10.1002/anie.202201475
日期:2022.5.9
A complementary modular coupling approach to the widely employed Suzuki coupling is disclosed herein, relying on organogermane-containing building blocks paired with air-stable PdI dimer based bond construction, which allows to significantly shorten the reaction times and close gaps in the accessible compound space.