54840-14-1Relevant academic research and scientific papers
Highly selective deblocking of propargyl carbonates in the presence of propargyl carbamates with tetrathiomolybdate
Ramesh,Bhat, Ramakrishna G.,Chandrasekaran, Srinivasan
, p. 837 - 840 (2007/10/03)
(Chemical Equation Presented) Propargyloxycarbonyl chloride, 1, has been used to protect the hydroxyl and amino functionalities of amino alcohols and aminophenols in one pot using triethylamine or pyridine as a base. The increased reactivity of benzyltriethylammonium tetrathiomolybdate, 2, toward propargyl carbonates over propargyl carbamates is studied in detail and has been exploited further to develop an orthogonal protection strategy for the hydroxyl and amino functionalities. For example, 2-amino-1-butanol, 6a, was treated with 1 to get the N,O-diPoc compound 7a in 90% yield, which when treated with 1.1 equiv of 2 at room temperature removes the Poc group attached to oxygen while leaving the one attached to nitrogen intact to yield compound 8a in 85% yield. This particular observation offers a new protecting strategy where an amine and an alcohol group can be protected simultaneously in one pot, and in a later synthetic step, if the alcohol group has to be deprotected selectively, it can be achieved with 1 equiv of 2.
Synthesis of potentially β-blocking practolol derivatives: (E + Z)-3- [4-(3-iodoprop-2-enyloxycarbonylamino)phenoxy]-1-(isopropylamino)propan-2-ol
Apparu, Marcel,Ben Tiba, Younes,Leo, Pierre-Marc,Fagret, Daniel
, p. 1007 - 1012 (2007/10/03)
The iodinatied carbamates 3 (E + Z), with potential β-blocking properties, were synthesized. The first route chosen, from 4-aminophenol and the chloroformate 7, had to be abandoned because of the formation of the oxazolidinone 10 during the epoxidation step. The aminoalcohol 17 prepared from the practolol 1 finally gave the target compounds by condensation with the iodoallylic chloroformates 8 (E + Z). The secondary Boc-protected amine function was regenerated without removing the carbamate function situated in the p-postion, by using mild reaction conditions (1 N HCl).
Ester of (alkynyloxy)-, (alkenyloxy)-, and (cyanoalkoxy) carbanilic acids and their use as herbicides
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, (2008/06/13)
The invention is novel esters of (alkynyloxy)-, (alkenyloxy)-, and (cyanoalkoxy) carbanilic acids and the thiono and dithio derivatives of the carbanilic acids, and their use for controlling broadleaf weeds and grasses.
