23727-16-4Relevant articles and documents
N,N,N′,N′-Tetramethylenediamine dioxide (TMEDAO2) facilitates atom economical/open atmosphere Ley-Griffith (TPAP) tandem oxidation-Wittig reactions
Read, Christopher D. G.,Moore, Peter W.,Williams, Craig M.
supporting information, p. 4537 - 4540 (2015/09/15)
N,N,N′,N′-Tetramethylethylenediamine dioxide (TMEDAO2) was explored as a more atom economical co-oxidant for the Ley-Griffith oxidation of alcohols to aldehydes. TMEDAO2 was found to selectivity oxidise benzylic and allylic alcohols in comparable yields to that of the standard Ley-Griffith co-oxidant (NMO). Importantly TMEDAO2 facilitated tandem Ley-Griffith-Wittig reactions with stabilised ylides, in good to excellent yields, without the requirement of anhydrous conditions.
Hydroboration. 90. Synthesis of 2-isobutyl- and 2-Isopropylapopinenes. Rates and Stoichiometry of the Hydroboration of 2-Organylapopinenes with Borane-Methyl Sulfide and Borane-Tetrahydrofuran
Brown, Herbert C.,Dhokte, Ulhas P.
, p. 2025 - 2032 (2007/10/02)
Two higher analogues of α-pinene, 2-isobutyl- and 2-isopropylapopinenes, promising chiral auxiliaries for asymmetric hydroboration, were readily synthesized from α-pinene in good chemical yield.A quantitative study was made of the rates and stoichiometry of the hydroboration of a number of representative 2-organylapopinenes (2-R-apopinenes) with representative boranes, such as BH3*SMe2 (BMS) and BH3*THF, in order to develop a convenient procedure for the synthesis of mono- and bis(2-organylapoisopinocampheyl)boranes , under investigation as possible improved asymmetric hydroborating reagents.It was evident that the sterically bulkier 2-R-apopinenes such as 2-phenyl- and 2-isopropylapopinenes reacted with boranes at room temperature to form essentially RapBH2 in >/=95percent yield, while a yield of >/=90percent was realized in the case of 2-isobutylapopinene.However, α-pinene, and 2-ethyl- and 2-n-propylapopinenes smoothly reacted with boranes to form a mixture of RapBH2 and Rap2BH.Under the reaction conditions employed, 2-ethyl-, 2-n-propyl-, 2-isobutyl-, 2-phenyl-, and 2-isopropylapopinenes failed to produce clean Rap2BH.The rate of hydroboration decreased significantly with increase in bulk of the organyl group at the 2-position of the apopinene.